GCA is a global consulting firm that provides engineering, environmental, and construction services to clients in the energy, transportation, and infrastructure sectors. The company was founded in 1989 and is headquartered in Houston, Texas. GCA has over 5,500 employees and operates in more than 50 countries around the world. The company's services include project management, engineering design, environmental consulting, and construction management. GCA has worked on some of the world's largest and most complex projects, including the Panama Canal expansion, the Hong Kong-Zhuhai-Macau Bridge, and the Trans-Alaska Pipeline System.