Samuel J. Simmons, 75, president and chief executive of the National Caucus on Black Aged Inc. since 1982, died of heart and lung ailments Jan. 12 at Washington Hospital Center.

Mr. Simmons also was a former assistant secretary for equal opportunity at the Department of Housing and Urban Development, a position he held from 1969 to 1972. He also had served in management positions with the Post Office and the Commission on Civil Rights.

Mr. Simmons, a resident of Washington, was born in Flint, Mich., and graduated from Western Michigan University. From 1950 to 1962, he had jobs with the Detroit NAACP and the Michigan Fair Employment Practices Commission, and he was the state's executive director of labor mediation.

He came to Washington in 1962 to join the Post Office Department, where he designed and implemented grievance and appeals procedures that emphasized complaint and advancement issues for minority employees. He received a Meritorious Service Award for this work.

Mr. Simmons was director of field operations for the Civil Service Commission from 1964 to 1969, when he became assistant secretary at HUD. His work there included administration of federal fair housing laws, and he wrote advertising guidelines to include the fair housing symbol that appears in real estate brochures, newspapers and mortgage banks.

In 1972, Mr. Simmons became the founding president of the National Center for Housing Management, which was established by presidential executive order to develop training programs for managers of government-assisted housing. Under his leadership, the center developed a certification program for managers of housing programs for the elderly.

From 1978 to 1994, Mr. Simmons served on the board of directors of Fannie Mae.

As president and chief executive of the National Caucus for Black Aged Inc., Mr. Simmons directed a major service and advocacy organization for elderly black people that provided housing for the elderly and disabled, managed housing projects for elderly people and provided employment and training opportunities.

Survivors include his wife of 53 years, Barbara Lett Simmons of Washington; two sons, David Clay Simmons and Robert Allen Simmons, both of Washington; three brothers; and a granddaughter.