Charles P. Johnson & Associates is a full-service civil engineering firm that specializes in providing land planning, engineering and surveying services to public and private sector clients. The company employs more than 100 licensed engineers, registered landscape architects and professional surveyors. In 2004, the company acquired a division of Environmental Services. Charles P. Johnson & Associates maintains three locations throughout Maryland, including its headquarters operation in Silver Spring, Md. Founded in 1971, the company provides engineering in the areas of water resources, land development, transportation, utility, commercial/industrial land development and public works.