Retired Army Col. George Stuart Brady, 90, an engineer who served during both world wars and the Korean conflict, died Thursday at the Bethesda Naval Medical Center.

A resident of the Washington area since the early 1930s, he had lived in recent years with a daughter, Patricia B. Hines of Boyds, Md.

Born in Danbury, Conn., Col. Brady graduated from Yale University in 1911 and became an engineer on the construction of the Panama Canal.

He entered the U.S. Army in 1917 as a captain and was an instructor at several camps in this country. During World War I, he went to France as administrative and technical officer of Army ordnance bases.

After the war, Col. Brady returned to civilian life but remained in the Reserves. He spent six years in South American as one of the first trade commissioners sent abroad by this country.

He came to Washington in the early days of the Roosevelt administration and was deputy administrator of the National Recovery Administration and technical advisor to the Coordinator for Industrial Cooperation.

In World War II, Col. Brady was with the Office of Civilan Suply and returned to active duty on the staff of the director of production of the Army Service Forces. He served during the Korean conflict as a conservation officer for the Nation Production Authority. He left the Army Reserves in 1953.

Col. Brady had been a consultant to many private firms, trade associations and labor unions and also at one time to the Office of Defense Mobilization.

He had lectured widely and was the author of numerous articles and short stories for periodicals. He wrote a number of books including "Materials Handbook," an encyclopedia for executives.

Col. Brady was active in the organization of the Clan na Gael for the revival of Gaelic language and literature. He was a Fellow of the American Geographical Society and former president of the Panama Canal Society.

In addition to Mrs. Hines, he is survived by another daughter, Jeanne B. Moulton, of Kensington: a son, George S. Brady Jr., of Pounding Mill, Va. 18 grandchildren and seven great-grandchildren.