Richard O. Simpson, formerly assistant secretary of Commerce in the Nixon administration and the first chairman of the Consumer Products Safety Commision, will return to Washington to head up Dynalectron Corp.'s new computer services division, the company announced.

Simpson had been chairman of Granada Data Systems Inc., a computer repair and maintenance company, and a part owner in Computer Repair Sales Inc., a computer parts distributor, before Dynalectron Corp. acquired the two Hayward, Calif., firms two weeks ago. Dynalectron Corp. is a diversified technological services firm based in McLean.

Dynalectron acquired the two firms as the first step in its planned expansion into the computer services market, employing a strategy similar to that used over the last 10 years in developing the company's electrical and mechanical contracting business, currently the firm's largest source of revenue, Executive Vice President Daniel R. Bannister said.

Simpson, 54, will be responsible for managing the new division and looking for additional acquisitions, Bannister said.

As a presidential appointee to the Commerce Department from 1970 to 1973, Simpson joined in efforts to develop the non-tariff trade barriers portion of the General Agreement on Tariffs and Trade, and served as the department's assistant secretary for science and technology.

Simpson was appointed to a three-year term as chairman of the Consumer Products Safety Commission when the commission was created by Congress in May, 1973.

Aside from his government career, Simpson has founded and sold several successful companies, including Litek International Inc., which developed a long-lasting replacement for the incandescent lamp, Pac Ord Inc., a naval weapons and electronics repair firm acquired by Dynalectron in 1976, and now, Granada Data Systems.