The earthquake engineering industry focuses on enhancing structural safety against seismic activity. Companies in this sector often specialize in seismic analysis, retrofitting designs, and risk assessments to reduce hazards from earthquakes. With intensified climate challenges and advancements in technology, the industry is adapting by integrating smart building systems and materials designed to absorb shocks. Global trends toward urban resilience lead to increased demand for innovative solutions. Moreover, the evolving regulatory environment emphasizes stricter compliance measures, further advancing the sector's development and significance in safeguarding communities prone to seismic risks.


This list features 23 prominent earthquake engineering companies predominantly based in the United States, with some operating globally. Spanning from newly founded firms like Miyamoto International México to established names such as Thornton Tomasetti, the companies vary in size, offering specialized services ranging from seismic evaluations to disaster management. Most were founded between the mid-20th century and late 2000s, reflecting a rich history of expertise in structural safety and resilience, particularly in earthquake-prone regions.


Read on to discover the top earthquake engineering companies.


Top 23 Earthquake Engineering Companies


1. Degenkolb Engineers

  • Website: degenkolb.com
  • Ownership type: Private
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 96%, Mexico 4%
  • Founded year: 1940
  • Headcount: 201-500
  • LinkedIn: degenkolb-engineers

Degenkolb Engineers, based in San Francisco, California, is a structural engineering firm that has been operational since 1940. The company specializes in seismic safety solutions, providing a range of services that include seismic evaluations, retrofitting, and construction engineering. Degenkolb serves a variety of sectors, notably healthcare, education, and government, where safety and compliance are paramount. The firm prides itself on its technical expertise and collaborative approach, ensuring that clients receive tailored solutions that meet stringent safety standards. With a team of over 300 experienced engineers, Degenkolb has successfully completed numerous projects that have significantly contributed to the safety and resilience of structures in earthquake-prone regions. Their focus on innovation and lifelong learning is evident in their ongoing professional development initiatives and participation in industry conferences.


2. Miyamoto International

  • Website: miyamotointernational.com
  • Ownership type: Private
  • Headquarters: West Sacramento, California, United States (USA)
  • Employee distribution: United States (USA) 53%, India 16%, Puerto Rico 6%, Other 24%
  • Founded year: 1946
  • Headcount: 201-500
  • LinkedIn: miyamoto-international

Miyamoto International is a structural engineering and disaster management firm based in West Sacramento, California. Founded in 1946, the company has carved out a niche in earthquake resilient engineering and disaster risk reduction. With a workforce of approximately 236 employees, Miyamoto operates globally, providing essential services to governments and organizations in regions prone to seismic activity. Their expertise includes designing new structures and assessing existing buildings to mitigate vulnerabilities to earthquakes. The firm has been involved in over 100 disaster operations, including significant earthquakes in Haiti, Nepal, and Turkey, where they have conducted damage assessments and facilitated recovery efforts. Miyamoto International is also committed to community development and resilience, working closely with local leaders to enhance infrastructure safety and sustainability. Their mission is to save lives and impact economies through innovative engineering solutions and disaster management practices.


3. MHP Structural Engineers

  • Website: mhpse.com
  • Ownership type: Private
  • Headquarters: Long Beach, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1973
  • Headcount: 11-50
  • LinkedIn: mhpstructuralengineers

MHP Structural Engineers, founded in 1973 and based in Long Beach, California, is a private engineering firm that specializes in structural engineering services. The company offers a range of services, including design, seismic evaluation, retrofit, and equipment anchorage. MHP is particularly focused on enhancing building safety and ensuring compliance with seismic standards, which is crucial in earthquake-prone areas. They serve a variety of clients, including educational institutions and healthcare facilities, and have completed numerous projects that emphasize safety and structural integrity. MHP has conducted over 10,000 seismic risk assessments across North America, showcasing their extensive involvement in the field of earthquake engineering. Their commitment to developing safer communities is evident in their mission and the projects they undertake.


4. Nabih Youssef & Associates

  • Website: nyase.com
  • Ownership type: Private
  • Headquarters: Los Angeles, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1989
  • Headcount: 51-200
  • LinkedIn: nabih-youssef-associates

Nabih Youssef & Associates (NYA) is a structural engineering firm based in Los Angeles, California, with additional offices across the United States and internationally. Established in 1989 by Nabih Youssef, the firm has built a reputation for its expertise in structural and earthquake engineering consulting services. NYA specializes in performance-based seismic design, a critical area in regions prone to seismic activity. The firm has been involved in numerous significant projects, including high-rise buildings, medical centers, and educational facilities, showcasing their capability in handling complex structural challenges. NYA has also played a pivotal role in shaping earthquake engineering standards, contributing to various guidelines and codes that are widely used today. Their commitment to innovation is evident in their advanced analysis and experimental testing programs, which aim to enhance structural systems and ensure safety in seismic events. With a dedicated team of experts, NYA continues to push the boundaries of earthquake engineering, providing clients with effective and sustainable solutions.


5. ZFA Structural Engineers

  • Website: zfa.com
  • Ownership type: Private
  • Headquarters: Santa Rosa, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1974
  • Headcount: 51-200
  • LinkedIn: zfa-structural-engineers

ZFA Structural Engineers, founded in 1974 and based in Santa Rosa, California, is a private structural engineering firm with a workforce of approximately 103 employees. The company specializes in providing engineering solutions for a variety of construction projects, with a particular emphasis on structural design, seismic evaluations, and the rehabilitation of historic structures. ZFA serves a broad clientele, including architects, contractors, and public agencies, and operates across multiple locations in Northern California. Their commitment to innovative and sustainable practices is evident in their approach to projects, which often involve complex engineering challenges. ZFA has been actively involved in post-disaster assessments, notably after the 2014 Napa earthquake, where they played a crucial role in helping the community recover by assessing and repairing damaged buildings. Their expertise in seismic retrofitting and their proactive engagement in community outreach further solidify their position in the earthquake engineering sector.


6. Saiful Bouquet Structural Engineers


Saiful Bouquet Structural Engineers, founded in 1997 and based in Los Angeles, California, is a private structural engineering firm that specializes in providing comprehensive engineering services across various construction projects. With a team of approximately 85 employees, the firm collaborates closely with architects and developers to deliver innovative structural solutions that prioritize safety and regulatory compliance. Their extensive portfolio spans multiple sectors, including healthcare, education, and commercial projects. Notably, Saiful Bouquet has a strong focus on seismic risk assessment and strengthening, which is crucial given California's seismic activity. The firm has been involved in numerous high-profile projects, such as the Kaiser Fontana Replacement Hospital and the Claremont McKenna College Robert Day Science Center, where they implemented advanced seismic design strategies. Their commitment to excellence is reflected in the accolades they have received, including awards for their projects and recognition in industry publications. Saiful Bouquet continues to be an influential player in the structural engineering field, particularly in earthquake engineering, as they actively participate in conferences and discussions related to seismic design and safety.


7. YOE (Yaron Offir Engineers) LTD


YOE (Yaron Offir Engineers) LTD, established in 2003 and based in Haifa, Israel, is an engineering firm that specializes in earthquake engineering and risk assessment. The company offers a range of services, including seismic analysis, building upgrades, and project management. They work primarily with government agencies, educational institutions, and private organizations, focusing on improving building safety in areas susceptible to earthquakes. YOE has contributed significantly to the field by developing advanced engineering practices tailored to the unique challenges posed by seismic activity. Their team is involved in various projects aimed at assessing and enhancing the structural integrity of buildings, ensuring compliance with safety standards, and providing expert guidance on earthquake resilience. The firm has also engaged in research to advance the understanding of seismic engineering, further solidifying its role in the industry.


8. Forell Elsesser

  • Website: forell.com
  • Ownership type: Private
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1960
  • Headcount: 11-50
  • LinkedIn: forellelsesser-engineers

Forell/Elsesser Engineers, Inc. is a structural engineering firm based in San Francisco, California, founded in 1960. The company specializes in structural and earthquake engineering services, providing a range of offerings that include structural design, peer review, and value engineering. They primarily serve clients in the construction and architecture sectors, focusing on civic and educational projects. Forell Elsesser is recognized for its innovative engineering solutions, particularly in the realm of seismic safety. They have been at the forefront of implementing advanced techniques such as seismic isolation and passive damping systems. Their expertise extends to post-earthquake reconnaissance, ensuring that they remain engaged with the latest developments in earthquake engineering. The firm has completed numerous projects that highlight their commitment to safety and sustainability, making them a notable entity in the industry.


9. SIRVE Engineering

  • Website: sirve.cl
  • Ownership type: Venture Capital
  • Headquarters: Las Condes, Santiago, Chile
  • Employee distribution: Chile 100%
  • Latest funding: Series A, January 2010
  • Founded year: 2003
  • Headcount: 51-200
  • LinkedIn: sirve-s-a-

SIRVE Engineering, established in 2003 and based in Las Condes, Santiago, Chile, is an engineering firm that specializes in seismic protection and structural engineering. The company was founded by engineers Carl Lüders and Juan Carlos de La Llera, emerging from the Pontificia Universidad Católica de Chile. SIRVE provides comprehensive solutions aimed at enhancing the safety and compliance of construction projects with seismic standards. Their services include structural engineering, seismic protection engineering, and risk and vulnerability assessments related to seismic activity. SIRVE has played a pivotal role in many significant projects across various sectors, including healthcare, industry, and infrastructure, utilizing advanced technologies such as elastomeric isolation and energy dissipation systems. Their innovative approach has earned them several awards, including the Avonni Award for Urbanism, Architecture, and Construction in 2010. SIRVE's mission is to improve the performance of structures against earthquakes, thereby enhancing the quality of construction and the safety of individuals.


10. Mrp Engineering

  • Website: mrpengineering.com
  • Ownership type: Private
  • Headquarters: Thailand
  • Employee distribution: Thailand 100%
  • Founded year: 1991
  • Headcount: 501-1000
  • LinkedIn: mrp-engineering

MRP Engineering, LLC is a private consulting firm based in Thailand, founded in 1991. The company specializes in structural engineering and risk analysis, focusing on the assessment and mitigation of risks associated with natural disasters, particularly earthquakes. MRP Engineering provides a range of services, including structural risk analysis, engineering design, and damage investigation. They assist businesses and organizations in evaluating their vulnerabilities and implementing effective risk reduction strategies. The firm has been involved in significant post-earthquake investigations, including those in Mexico, Napa, and Haiti, showcasing their expertise in the field. Their commitment to advancing building standards and providing practical, cost-effective solutions highlights their role in enhancing safety and operational continuity for their clients.


11. Rene Lagos Engineers

  • Website: renelagos.com
  • Ownership type: Private
  • Headquarters: Las Condes, Santiago, Chile
  • Employee distribution: Chile 75%, Peru 25%
  • Founded year: 1977
  • Headcount: 51-200
  • LinkedIn: rene-lagos-engineers

Rene Lagos Engineers is an engineering consulting firm based in Las Condes, Santiago, Chile, founded in 1977. With a workforce of approximately 60 employees, the company has carved out a niche in structural and seismic engineering. They provide a comprehensive suite of services, including seismic protection systems, performance-based seismic design, and BIM consulting. Their clientele spans construction companies and public institutions, all seeking to enhance safety and compliance in their projects, especially in areas vulnerable to seismic activity. The firm has successfully designed over 20 million square meters of structures, showcasing their extensive experience in the industry. Their commitment to innovation is evident in their ongoing research and development efforts aimed at improving construction methodologies and technologies. This proactive approach positions them as a relevant player in the earthquake engineering sector.


12. Ulker Muhendislik

  • Website: ulkermuhendislik.com.tr
  • Ownership type: Private
  • Headquarters: Istanbul, İstanbul, Turkey
  • Employee distribution: Turkey 67%, Italy 33%
  • Founded year: 1988
  • Headcount: 11-50
  • LinkedIn: ulker-muhendislik

Ulker Muhendislik, established in 1988, is an engineering firm based in Istanbul, Turkey, that specializes in earthquake engineering and structural design. With a workforce of around 39 employees, the company has built a reputation for providing essential services such as seismic isolation, structural health monitoring, and technical consulting for construction projects. Their clientele includes both construction companies and government agencies, reflecting their expertise in ensuring compliance with seismic regulations. Over the years, Ulker Muhendislik has successfully completed numerous projects, including notable works like the seismic isolation systems for the Turkcell Gebze Data Center and the Adana Integrated Health Campus, which is recognized as one of the largest seismic-isolated structures in the world. The firm is also involved in software development aimed at enhancing design processes in earthquake and structural engineering. Their commitment to quality is underscored by their ISO 9001 certification, and they actively participate in committees that shape engineering standards in Turkey. This extensive experience and proactive approach position Ulker Muhendislik as a significant player in the earthquake engineering sector.


13. Crosby Group / Structural Engineering and Design

  • Website: crosbygroup.com
  • Ownership type: Private
  • Headquarters: San Mateo, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1992
  • Headcount: 11-50
  • LinkedIn: crosby-group

Crosby Group / Structural Engineering and Design, based in San Mateo, California, is a private engineering firm founded in 1992. The company specializes in structural engineering and seismic retrofitting, providing a range of services that include design-build capabilities, structural evaluations, and innovative solutions tailored to various sectors, including healthcare and government. With a focus on safety and compliance, Crosby Group has developed a reputation for addressing seismic and structural deficiencies through research and the application of new technologies. Their portfolio includes notable projects that have set benchmarks in the industry, such as the first new concrete structure in the U.S. to utilize base isolation and the first passive damper project completed in the country. The firm has also been recognized for its contributions to the field, receiving awards for projects that demonstrate excellence in structural engineering and design. Crosby Group's commitment to continuous improvement and innovation positions it as a relevant player in the earthquake engineering sector.


14. Thornton Tomasetti

  • Website: thorntontomasetti.com
  • Ownership type: Private
  • Headquarters: New York, New York, United States (USA)
  • Employee distribution: United States (USA) 68%, India 16%, United Kingdom (UK) 8%, Other 8%
  • Founded year: 1949
  • Headcount: 1001-5000
  • LinkedIn: thornton-tomasetti

Thornton Tomasetti is a scientific and engineering consulting firm based in New York City, founded in 1949. With a workforce of approximately 1,828 employees, the company operates globally, providing a wide array of services that include structural engineering, facade engineering, and sustainability solutions. They cater to various sectors such as architecture, construction, and defense, tackling complex engineering challenges to enhance project outcomes. Notably, Thornton Tomasetti has a strong emphasis on resilience and sustainability, which are crucial in the context of earthquake engineering. Their commitment to research and development further positions them to address the evolving demands of the industry, including the need for structures that can withstand seismic forces. The firm has successfully completed projects in over 150 countries, demonstrating their extensive experience and capability in managing projects of varying scales and complexities.


15. Murphy Burr Curry, Inc. Structural Engineers


Murphy Burr Curry, Inc. Structural Engineers, established in 1997 and based in San Francisco, California, is a private structural engineering firm that provides a comprehensive range of consulting services. The company is known for its expertise in historic renovation, seismic retrofit, and new building design. They work closely with property owners, architects, and contractors to deliver tailored engineering solutions that address complex structural challenges. With a focus on safety and resilience, Murphy Burr Curry has built a reputation for evaluating buildings damaged by natural disasters, particularly earthquakes, fires, and storms. Their commitment to seismic upgrades ensures that existing structures meet modern safety standards. Over the years, they have successfully completed over 1,000 projects across the United States, showcasing their capability and reliability in the field of structural engineering.


16. Hohbach-Lewin Structural and Civil Engineers

  • Website: hohbach-lewin.com
  • Ownership type: Private
  • Headquarters: Palo Alto, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1998
  • Headcount: 51-200
  • LinkedIn: hohbach-lewin

Hohbach-Lewin Structural and Civil Engineers, founded in 1998, is a private engineering firm based in Palo Alto, California, with additional offices in San Francisco, Pasadena, and Eugene, Oregon. The company specializes in structural and civil engineering services, providing tailored solutions to architects, building owners, and contractors across a range of construction projects. Their services include seismic evaluations, retrofit designs, and comprehensive civil engineering and surveying. Hohbach-Lewin has built a reputation for delivering reliable and timely engineering solutions, ensuring compliance with safety and design standards. The firm has worked on numerous projects, including academic institutions, healthcare facilities, and residential developments, with a notable emphasis on seismic projects, reflecting their commitment to addressing the unique challenges posed by earthquakes in their operating regions.


17. John A. Martin & Associates, Inc.

  • Website: johnmartin.com
  • Ownership type: Private
  • Headquarters: Los Angeles, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1953
  • Headcount: 51-200
  • LinkedIn: john-a.-martin-%26-associates

John A. Martin & Associates, Inc. (JAMA) is a structural engineering firm based in Los Angeles, California, founded in 1953. With a workforce of approximately 109 employees, JAMA has built a reputation for its expertise in structural engineering services, particularly in seismic evaluations and retrofits. The firm serves a variety of clients, including architects, contractors, and public agencies, emphasizing collaboration and innovative design solutions. JAMA has been involved in numerous high-profile projects, such as the seismic upgrades of UCLA's Royce Hall and the renovation of the Glendale Central Library, demonstrating their proficiency in enhancing the earthquake resilience of existing structures. Their approach integrates advanced technologies and computational design, ensuring that they remain at the forefront of engineering practices. JAMA's commitment to sustainability and preserving the cultural value of buildings further underscores their role in the industry.


18. Simpson Gumpertz & Heger (SGH)

  • Website: sgh.com
  • Ownership type: Private
  • Headquarters: Waltham, Massachusetts, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1956
  • Headcount: 501-1000
  • LinkedIn: simpson-gumpertz-%26-heger-inc

Simpson Gumpertz & Heger Inc. (SGH) is an engineering firm based in Waltham, Massachusetts, established in 1956. The company specializes in structural design, building enclosures, and advanced analysis, catering to various sectors including commercial, educational, healthcare, and infrastructure. SGH is known for its comprehensive approach to engineering challenges, providing solutions for new construction, rehabilitation, and performance evaluation of structures. Their services include seismic engineering, where they assess and enhance the ability of structures to withstand earthquakes. SGH's commitment to research and applied science is evident in their laboratory capabilities, which support their investigations into structural failures and material performance. The firm actively engages in industry events and conferences, showcasing their expertise and thought leadership in the field of earthquake engineering.


19. Structural Focus

  • Website: structuralfocus.com
  • Ownership type: Private
  • Headquarters: Gardena, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2001
  • Headcount: 11-50
  • LinkedIn: structural-focus

Structural Focus, founded in 2001 and based in Gardena, California, is a structural engineering firm that specializes in innovative design and engineering services for a variety of construction projects. With a team of 26 employees, the firm collaborates closely with architects and developers to ensure structural integrity and compliance with safety standards. Their services include seismic evaluation and retrofit, which are essential for enhancing the resilience of buildings in earthquake-prone regions. Structural Focus has successfully completed numerous projects, rehabilitating existing structures and designing new ones, including historic buildings. Their commitment to quality and client service is reflected in their long-standing relationships with notable clients such as Sony Pictures and Warner Bros. The firm prides itself on its collaborative approach, ensuring that every project meets the unique needs of its clients while adhering to the latest codes and standards.


20. Consultora-pra Pedro Rojas & Asociados S.A.


Consultora PRA - Pedro Rojas y Asociados S.A. is an engineering consultancy based in Guayaquil, Ecuador, founded in 2019. The firm specializes in seismic-resistant structures and multidisciplinary projects, offering a range of services that include structural evaluation, rehabilitation, and geotechnical engineering. Their team consists of highly qualified civil engineers, led by Ph.D. Pedro Rojas, who have extensive experience in both national and international projects, particularly in high seismic risk areas. The company is committed to ensuring compliance with safety standards in the construction and infrastructure sectors. They have worked on significant projects, providing services that include the design and monitoring of structures subjected to dynamic loads, which is crucial in earthquake-prone regions. Their focus on innovative and efficient engineering solutions positions them as a relevant player in the earthquake engineering sector.


21. Miyamoto International México


Miyamoto International México is a private engineering firm based in Cuauhtemoc, Ciudad de México, specializing in structural and seismic engineering. Established in 2018, the company has quickly positioned itself as a key player in the field, offering services that include building recovery, construction management, and advanced structural design. Their expertise is particularly valuable in earthquake-prone regions, where they help clients enhance the resilience of their structures against seismic events. The firm is dedicated to reducing damage and facilitating recovery after disasters, showcasing their commitment to safety and innovation in engineering. With a team of 15 employees, Miyamoto International México operates entirely within Mexico, focusing on local needs while drawing on global engineering practices. Their projects often involve collaboration with governmental bodies and international organizations, reflecting their active role in improving infrastructure resilience in the face of natural disasters.


22. Wiss, Janney, Elstner Associates, Inc.

  • Website: wje.com
  • Ownership type: Private
  • Headquarters: Northbrook, Illinois, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1956
  • Headcount: 501-1000
  • LinkedIn: wiss-janney-elstner-associates-inc-

Wiss, Janney, Elstner Associates, Inc. (WJE) is a professional services firm based in Northbrook, Illinois, specializing in engineering, architecture, and materials science. Founded in 1956, WJE has built a reputation for providing a wide range of services, including structural engineering, forensic analysis, and materials testing. The firm operates through a network of offices across the United States, employing nearly 900 professionals. WJE's expertise extends to seismic engineering, where they assess and design structures to withstand earthquake forces. Their extensive laboratory and field testing capabilities allow them to investigate and innovate solutions for various construction challenges. With a commitment to sustainability and a hands-on approach to problem-solving, WJE has successfully completed over 175,000 projects, demonstrating their significant impact in the built environment.


23. Holmes US

  • Website: holmes.us
  • Ownership type: Private
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 98%, Other 2%
  • Founded year: 2001
  • Headcount: 51-200
  • LinkedIn: holmes-structures

Holmes US is a structural and fire engineering firm based in San Francisco, California, founded in 2001. With a workforce of approximately 129 employees, the company specializes in providing engineering solutions for the construction and real estate sectors. Their services include product development and testing, with a notable emphasis on retrofitting unreinforced masonry buildings, which are particularly susceptible to earthquake damage. Holmes US is recognized for its innovative approaches to building safety and compliance, focusing on sustainability and resilience in its designs. The firm has been involved in various high-profile projects, including mass timber structures and seismic safety upgrades for historic buildings, demonstrating its commitment to addressing the unique challenges posed by seismic activity. Holmes US operates not only in the United States but also has a presence in Australia, New Zealand, and the Netherlands, reflecting its international expertise and collaborative approach to engineering.



Earthquake Engineering Insights: Key Companies


CompanyHeadquarterSizeFoundedOwnership
Degenkolb EngineersSan Francisco, California, United States (USA)201-5001940Private
Miyamoto InternationalWest Sacramento, California, United States (USA)201-5001946Private
MHP Structural EngineersLong Beach, California, United States (USA)11-501973Private
Nabih Youssef & AssociatesLos Angeles, California, United States (USA)51-2001989Private
ZFA Structural EngineersSanta Rosa, California, United States (USA)51-2001974Private
Saiful Bouquet Structural EngineersLos Angeles, California, United States (USA)51-2001997Private
YOE (Yaron Offir Engineers) LTDHaifa, Haifa, Israel11-502003Private
Forell ElsesserSan Francisco, California, United States (USA)11-501960Private
SIRVE EngineeringLas Condes, Santiago, Chile51-2002003Venture Capital
Mrp EngineeringThailand501-10001991Private
Rene Lagos EngineersLas Condes, Santiago, Chile51-2001977Private
Ulker MuhendislikIstanbul, İstanbul, Turkey11-501988Private
Crosby Group / Structural Engineering and DesignSan Mateo, California, United States (USA)11-501992Private
Thornton TomasettiNew York, New York, United States (USA)1001-50001949Private
Murphy Burr Curry, Inc. Structural EngineersSan Francisco, California, United States (USA)11-501997Private
Hohbach-Lewin Structural and Civil EngineersPalo Alto, California, United States (USA)51-2001998Private
John A. Martin & Associates, Inc.Los Angeles, California, United States (USA)51-2001953Private
Simpson Gumpertz & Heger (SGH)Waltham, Massachusetts, United States (USA)501-10001956Private
Structural FocusGardena, California, United States (USA)11-502001Private
Consultora-pra Pedro Rojas & Asociados S.A.Guayaquil, Guayas, Ecuador11-502019Private
Miyamoto International MéxicoCuauhtemoc, Ciudad De México, Mexico11-502018Private
Wiss, Janney, Elstner Associates, Inc.Northbrook, Illinois, United States (USA)501-10001956Private
Holmes USSan Francisco, California, United States (USA)51-2002001Private


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