Mark Ashley Sellers, senior member of the law firm of Sellers, Conner & Cuneo and a well known administrative lawyer, died Thursday at his Washington Post home of a heart condition.

A native of Grand Bay, Ala., Mr. Sellers received a B.A. degree from Princeton University, an LL.B. from Emory University in 1928, and an LL.D. from Harvard law School in 1933.

From 1931 to 1938, he was professor of law at Emory University and the University of Georgia. He ialso was a special assistant to the U.S. Attorney General and an assistant solicitor in the solicitor in the Department of Agriculture from 1933 to 1943. From 1943 to 1945, Mr. Sellers was an assistant war food administrator.

Mr. Sellers was an active member of American Bar Association. From 1949 to 1950, he was chairman of the association's administrative law section, and from 1952 to the present he was a member of the House of Delegates of the ABA, having been reelected every three years.

He was also a member of the Federal Bar Association, the Bar of the Supreme Court of the United States, the Texas Bar, the American Law Institute. He was also a fellow in the American Bar Foundation, and served on that organization's board of directors.

Mr. Sellers was a member of the Selden Society, the Terrace Club of Princeton, N.J., the National Lawyers Club, and the Metropolitan Club, and was a former president of the Cosmos Club.

Survivors include his wife, Katherine Luther Sellers, of the home; two brothers, Abbott Mannie Sellers, of Alexandria, and Tom Fort Sellers, of Atlanta; a son, Mark Jr., of Grand Rapids, Mich.; a daughter, Katherine Patman, of Austin, Tex., and four grandchildren.