Supreme Court Clerk Alexander L. Stevas will retire in July after five years on the job. Stevas, 62, served for 10 years as clerk to the D.C. Court of Appeals before joining the Supreme Court in 1980.

Stevas will continue to teach at the George Washington University law school. He has been teaching at the school, his alma mater, since 1966. No successor has been named.

Robert Goffus, inspector general at the Federal Emergency Management Agency, is becoming the agency's comptroller. Goffus, who supervised the recent probe of mismanagement at FEMA before the Justice Department took it over, will be succeeded by John Thiede, who was chief investigator on the case. The current comptroller, Dennis W. Boyd, is moving to a job with the agency's state and local programs.

The exodus continues, meanwhile, at the Housing and Urban Development Department. Maurice L. Barksdale, a former mortgage banker, has resigned as federal housing commissioner to return to private business in Texas. Barksdale said he is considering a political career there.

At the Government National Mortgage Corp., executive vice president Warren Lasko has resigned to join the Mortgage Bankers Association. Lasko's resignation closely follows that of GNMA's president, Robert Karpe.

David P. Prosperi, a former assistant press secretary to Reagan, has been named press secretary of the Energy Department. Prosperi served in the White House from 1981 to 1982. Most recently, he served as manager of government affairs for the Washington office of the Superior Oil Co.

At the Health and Human Services Department, Patrice H. Feinstein, associate administrator for policy of the Health Care Financing Administration, has announced her resignation, effective March 1, because she is expecting a baby.

Also leaving is Glenna M. Crooks, deputy assistant secretary of HHS for health planning and evaluation. She is taking a position with the American Pharmaceutial Association.