Olsson Associates is an engineering and design firm that has been undertaking public and private projects throughout the United States since 1956. It serves clients in the water resources, land development, urban planning, transportation, geotechnical, mechanical and electrical industries. The employee-owned company has a staff of more than 600 individuals. Olsson Associates also maintains locations in Arizona, Colorado, Iowa, Kansas and Minnesota. It operates a subsidiary, Cordilleran Compliance Services. The company additionally provides building, community, field and land development services. Olsson Associates has undertaken projects for Rio Vista Park, Meritage Homes and Hickory Hills Middle School. It is a part of OEI.