Harold O. Wilson, the 41-year-old director of Rural Housing Improvement, Inc., in Massachusetts, has been named to succeed Gordon Cavanaugh as executive director of the Housing Assistance Council (HAC). A national non-profit rural housing organization, HAC is funded federally and provides loans, technical assistance, training and research services to public housing agencies in small towns and rural America. Cavanaugh was named in May by President Carter as administrator of the Farmers Home Administration.

Bradeon Companies' president James L. Eichberg has been named chairman of the 1978 Washington Board of Realtors and Morgage Bankers Association of Metropolitan Washington annual convention, scheduled for the Homestead hotel in Hot Springs, Va. Vice chairman will be Walter L. Mess, vice president of the Donald H. Richardson Co.

Joseph C. Murray, vice president for property management of Shannon & Luchs will be the featured speaker Monday night at a meeting of the D.C. chapter, National Society of Professional Resident Managers, at the Golden Ox restaurant.

Washington Gas Light Co. is sponsoring a one-day sales management seminar on professionalism among realtors and builders, Sept. 27, at the Shoreham Americana Hotel. Speakers will include James H. Mills, president of Home Facts Research in Darien, Conn., and Raymond L. Falcione, a University of Maryland faculty member. The session begins at 9 a.m. and costs $75 apiece, including a workbook. For more information, contact Herb Tanner at WGL in Springfield.

B.M. (Duke) Rosoff, sales manager for Century 21 suburban properties in Rockville, has been awarded the Graduate Realtors Institute designation by the Realtors Institute of Maryland.

Jorgen Graugaard, head of the specifications and material research department for the Alexandria architectural-engineering firm of Saunders, Cheng & Appleton, is the new president of the metropolitan area chapter of the Construction Specifications Institute.

John McShea, former president of Riviere Realty Trust and a member of the Washington Board of Realtors, is the new president of the North American Telephone Association, a trade group for firms that manufacture and sell non-Bell System telephone equipment. McShea organized Atlantic Telephone Co., of Rockville, in 1969.

Buford W. Duke Jr., a co-founder of the Falls Church architectural and planning firm of Winesett-Duke Inc., has been appointed corporate vice president and principal for design and project development at Benham-Blair & Assocaites, an Oklahoma City firm.