Marvin W. Simmons Sr., 82, the founder of the M.W. Simmons Co., a real estate firm in Rockville, died of cardio-pulmonary arrest Nov. 1 at the Shady Grove Adventist Hospital in Rockville.

Mr. Simmons, who lived at Rossmoor Leisure World in Silver Spring, was born in Tyrrell County, N.C. He moved to the Washington area in 1920. In 1928, he founded Bethesda Motors, a Chrysler dealership. He ran that business until 1950. In 1948, he founded the M.W. Simmons Co. and continued to operate it until his death. One of his projects was the development of the Glen Hills subdivision in Rockville.

Mr. Simmons was a charter member and past president of the Montgomery County Board of Realtors, which named him its "realtor of the year" in 1965. He also was a charter member and past president of the Bethesda Chamber of Commerce and the Bethesda Lions Club. He was a past president of the Montgomery County Chamber of Commerce and a founder of the Rockville and Bethesda volunteer fire departments. He was a charter member of the Rockville Chamber of Commerce and in 1978 received its "citizen of the year" award. He was a member of Bethesda Masonic Lodge No. 204.

Survivors include his wife, Virginia Hudson Simmons of Silver Spring; two daughters, Nedra Iwerks of Naperville, Ill., and Eloise Cleveland of Rockville; two sons, Marvin W. Jr., of Gaithersburg, and George H., of Rockville; two brothers, Dennis C., of Rockville, and Ralph L., of Edenton, N.C.; 19 grandchildren, and 18 great-grandchildren.