Established in 1965, Mitchell Associates is one of the leading design companies in the United States. Based in Wilmington, Del., the company specializes on interior architectural and environmental-graphic designing, space planning and donor recognition. Its list of architectural services includes interior design, facilities planning/management, feasibility studies and signage. Mitchell Associates also provides a series of services in commemorative plaques, history exhibits and interpretive displays. Its list of clients includes Boston Children's Hospital, Astra Zeneca, Harford Memorial Hospital and Accenture.