Edgar B. Brossard, 91, who had served with the U.S. Tariff Commission for 36 years and was its chairman during the Republican Hoover and Eisenhower administrations, died Saturday in Salt Lake City of complications following surgery for a hernia.

At the time of his retirement in 1959, President Eisenhower referred to him as "am example of the highest dedication" to the public service.

Dr. Brossard began his federal government career in 1917 as an employe of the Agriculture Department, Teaching economics at Utah State University. He was appointed from civil Service rolls as an economist on the Tariff Commission staff in 1923, when he came to Washington.

Two years later, President Coolidge appointed him a member of the bipartisan Tariff Commission. He was reappointed by president Hoover, Roosevelt, Truman and Eisehower.

He had served as an alternate U.S. delegate to the 1947 Geneva and 1948 Havana International Conferences on Trade and Employment and as an official delegate to the 1956 Geneva Conference. He also was chairman of the Committee for Reciprocity Information and a member of the Interdepartmental Committee on Trade Agreements.

Dr. Brossard had served as a member of the Interdepartmental Committee on Inter-American Affairs and of the executive committee of the Interdepartmental Committee on Scienctific and Cultural Cooperation.

He was born on a cattle range at Oxford, Idaho, and moved with his family as a boy to Logan, Utah. He graduated from Utah State University and earned a master's degree and doctorate from the University of Minnesota. He also studied at Cornell University.

After his retirement from government service, Dr. Brossard became president of the New England Mission of the Church of Jesus Christ of Latter-Day Saints in Cambridge, Mass. Later he was president of the French Mission of the Mormon Church in Paris.

He had lived in Salt Lake City since 1961 and was involved in church affairs there.

Dr. Brossard was a former president of the Public School Association. of D.c. He had belonged to the Tacomis Club, the National Grange and the Cosmos Club.

His wife, the former Laura Cowley, died in 1976.

He is survived by a brother, R. Elmer Brossard of La Center, Wash.