Richard L. Corrigan has been named vice president for governmental affairs for CH2M Hill of Reston, an international consulting firm of engineers, planners, economists and scientists.

Dava Cardwell has joined Design and Production Inc. as marketing director of exhibit systems sales.

Don J. Pitt has been appointed president of Dunhill of Alexandria.

Wilbur C. Shepherd has been named vice president of the technical services division of Calculon Corp. The division supports the Department of Energy's Office of Computer Services and Telecommunications Management in Germantown.

Ken Murray has been appointed head of the new Washington office of Interiors Inc., a commercial interior planning and design consulting firm.

Albert Behar has been elected vice president of systems development for STSC Inc. of Bethesda.

Timothy Omali Okolo has joined the Washington office of Watson, Rice & Co., certified public accountants, as a staff accountant.

James W. Emery has been promoted to branch manager of the new east Baltimore office of Wells Fargo Guard Services.

James W. Andrews has joined the civil engineering and surveying firm of Oyster, Imus & Petzold Inc. of Wheaton.He will be responsible for surveying operations, subdivision planning and site plans.

Phillip A. Lowe has been appointed technical director for synthetic fuels for Nus Corp., a Rockville-based energy and environmental consulting firm. Maurice F. Bender was appointed manager of energy and environmental services for the company's north central regional operations based in Chicago.