Art Gensler founded the company in 1965. The company originally focused on corporate interiors, creating groundbreaking interiors for new office buildings. Since then, the architecture firm has diversified into many forms of architecture and design, including commercial office buildings, shopping malls, airports, educational institutions, entertainment complexes, planning and urban design, mission-critical facilities, consulting, brand design and other areas. The Gensler has grown rapidly. Gensler becomes an international design and architecture firm.

Art Gensler opened offices in the United States in the 1970s and 1980s and overseas offices in the 1980s and 1990s. The first overseas offices were opened in London in 1988 and new offices in Tokyo and Hong Kong in 1993. In 2002, Gensler opened an office in Shanghai and established a permanent presence in China.In 2021, Gensler had revenues of $1.235 billion, the highest of any US architectural firm. As of 2021, Gensler has offices in 49 cities in 16 countries worldwide, serving customers in more than 100 countries.

Services: Architecture, Brand Design, Consulting & Real Estate, Digital Experience Design, Interior, Design, Sustainability, Urban Strategies & Design

Founded: 1965
Headquarters: San Francisco, California
Revenue: $1-1.5bn
Website: https://www.gensler.com/

Nikken Sekkei is a Japanese architecture, design, and engineering firm headquartered in Chiyoda, Tokyo. Today Nikken Sekkei is considered the second largest architectural firm in the world.

Nikken Sekkei is a leading Japanese architecture firm founded 115 years ago. The company has grown into a professional services company in the fields of architecture, urban planning, and the environment with 1,900 employees and more than 2,400 employees throughout the Nikken group.

Services: Architectural design, Interior design,Urban design and planning, Landscape design, Structural engineering, MEP, engineering, Civil engineering, Computation design & BIM, Sustainability, Resilience, Consulting

Founded: 1900
Headquarters: Iidabashi, Chiyoda-ku, Tokyo, Japan
Revenue: $500-599m
Website: https://www.nikken.co.jp/en/

HDR Inc. is an employee-owned design firm specializing in engineering, architecture, environmental and construction services. HDR has carried out projects in 50 US states and 60 countries, including notable projects such as the Hoover Dam Bypass, Fort Belvoir Community Hospital, and the Roslin Institute Building.

HDR Inc. employs more than 10,000 professionals and represents hundreds of disciplines in multiple markets. HDR is the 10th largest employee-owned company in the United States with over $2.4 billion in revenue in 2017. Engineering NewsRecord named HDR the 7th largest design company in the US for 2019. However, in 2021, the company is expected to rank third in the world's largest architecture companies.

Services: Architecture, Planning & Consulting, Asset Management, Project Delivery, Commissioning & Operations, Real Estate, Economics & Finance, Research, Engineering, Sustainability & Resiliency, Environmental Sciences

Founded: 1917
Headquarters: Omaha, Nebraska United States
Revenue: $400-499m
Website: https://www.hdrinc.com/

Sweco is one of "Sweden's Best Architects" and the first among Europe's Best Architects. The Swedish architectural firm has extensive experience in architecture, design, urban planning and construction. Founded in 1958, today more than 1,300 architects work in offices in Denmark, Sweden, Germany, Finland, Poland, Belgium and Norway. Bringing Sweco's 17,000 architectural, engineering and environmental experts to take over projects from design and planning to construction and site supervision.

Sweco works in small, close teams to ensure professional excellence on all projects, regardless of size. Creating value through architecture to ensure a high quality of life in a healthy city through high-quality design of places, spaces and buildings. Together with our customers, Sweco is transforming communities and cities into a sustainable future and reducing our environmental impact.

Services: Architecture design and Consultancy

Founded: 1997
Headquarters: Kungsholmen, Stockholm, Sweden
Revenue: $2-2.5bn
Website: https://www.swecogroup.com/

Established in 1974 in Toronto, Ontario, Canada, IBI Group Inc. is a Canadian-based international professional services company consulting in the fields of architecture, engineering, planning, landscape architecture, transportation, and technology. IBI Group provides professional consulting services around the world.

Since 2011 IBI Group Inc. has been listed among the largest architecture or architecture/engineering firms in the world. As of 2016, it has over 2,400 employees and operates more than 60 offices in North America, Europe, Asia, and the Middle East. In 2016 its operations in Canada accounted for 60% of its workload, its US operations 20%, and the UK operations 15%.

Services: Architecture, engineering, planning and urban design, interiors, landscape architecture, systems, services a-z search.

Founded: 1974
Headquarters: Toronto, Ontario, Canada
Revenue: $290-299m (2019)
Website: http://www.ibigroup.com/

Aedas is one of the world's largest global architecture and design practices. founded in 2002 by Keith Griffiths, the firm now has offices in London, Hong Kong, Beijing, Chengdu, Ho Chi Minh city, Macau, Shanghai, Singapore, Los Angeles, Seattle, Abu Dhabi, Dubai, and New Delhi.

Aedas is also the world’s only local and global architecture and design practice driven by global sharing of research, local knowledge, and international practice. 1,400 creative minds with design studios across the globe create world-class design solutions with deep social and cultural understanding of the communities. View World of Aedas is that cities are changing to respond to greater density, connectivity and efficiency. Asia leads in new urban planning strategies and new methods of living.

Services: Architecture, Landscape, Urban Design, master planning

Founded: 2002
Headquarters: Hong Kong
Revenue: $240-249m
Website: http://www.aedas.com/

Perkins&Will is a global design practice founded in 1935. Since 1986, the group has been a subsidiary of Lebanon-based Dar Al-Hadassah. Phil Harrison has been the firm's CEO since 2006.

Perkins&Will designs buildings for schools, universities and hospitals, as well as for corporate and private clients. His projects range from office buildings and high-rise condos to hotels, convention centers, laboratories, and elementary schools. The company also provides interior design, branding, layout and urban design. The company's clients include Chicago O'Hare, New York University, Pfizer, and Time Warner. Perkins + Will has approximately 24 offices worldwide.

Services: architecture, interior design, branded environments, urban design, and landscape architecture.

Founded: 1935
Headquarters: Chicago, Illinois, USA
Revenue: $600-699m
Website: http://perkinswill.com/

Perkins Eastman is a global architecture, interior design, urban design, planning, landscape, graphic design and project management firm. The company is headquartered in New York, USA and is led by founders Bradford Perkins and Mary Jean Eastman.

Perkins Eastman believes that design can have a positive and lasting impact on people's lives. With over 1,000 employees in 19 locations around the world, the company works seamlessly across boundaries, obstacles, and disciplines to bring people and ideas together.

Services: urban, interior, and sustainable design and planning services

Founded: 1981
Headquarters: New York City, United States
Revenue: $260-269m
Website: http://www.perkinseastman.com/

As one of the world's largest architectural firms, HKS has designed sports and entertainment, medical, hotel, industrial and corporate buildings in the United States and abroad. The company provides structural design, architecture, project management, interior and graphic design services.

HKS provides planning and development, programming, branding, research and consulting services. Some of the company's work includes the Benefield building, the Lopesan Costa Bavaro resort and village, Cambodia's first Laumes International Motor Racing Circuit, and the Biolab Research Center in Singapore.

Services: planning and development, programming, branding, research and consulting services.

Founded: 1939
Headquarters: Dallas, Texas, United States
Revenue: $170-179m
Website:http://hksinc.com/

Heerim Architects Co., Ltd. (Heerim) is a construction and construction service provider. The company's portfolio of services includes architecture, interior design, landscape design, business planning, renovation, building renovation, urban design, sustainable design, project coordination planning, commercial space planning, and architectural studies.

Heerim also provides construction management services, construction supervision, planning and feasibility studies, bid management services, financial planning, and construction management services. The company serves the government, hospitality, transportation, residential, educational, commercial and retail sectors. He has worked in Korea, Azerbaijan, Bangladesh, UAE, Vietnam, China and Iraq. Heerim is headquartered in Seoul, Korea.

Services: Architectural Design, Interior Design, Landscape Design,.....

Founded: 1970
Headquarters: Gangdong-gu Area, Seoul, South Korea
Revenue: $170-179m
Website: http://www.heerim.com/