Clark Nexsen is an architecture and engineering firm that provides a wide range of services, including architecture, engineering, planning, interior design, landscape architecture, and more. The company was founded in 1920 and has since grown to become one of the largest architecture and engineering firms in the United States. Clark Nexsen has worked on a variety of projects, including commercial, educational, healthcare, and government buildings. The company is committed to sustainability and has received numerous awards for its green building designs.