He graduated from the United States Military Academy in 1931, and was commissioned in Field Artillery.
During World World War II, Parker went to Iceland with the first Army contingent to go overseas, and spent two years there. He returned to the United States. to train an artillery battalion, then served as G-3 Operations Officer on the Ninth United States Army throughout its campaigns in the European Theater of Operations. After the war he wrote the book Conquer, The Official History of the Ninth Army in World World War World War II During the Korean War, he commanded both a division and corps artillery, and later an anti-aircraft artillery brigade and region in the United States.
From 1960 to 1961 he commanded the 1st Infantry Division at Fort Riley.
His service in the politico-military field includes three years on the War Department General Staff, a year in the Executive Office of the President, and more than three years in Paris with the North Atlantic Council, the major part of it as the Standing Group"s Representative to the Council. Parker was a graduate of the battery and advanced officer"s courses at Fort Sill, Oklahoma, the Command and General Staff School at Fort Leavenworth, and the National War College.
From 1935 to 1939, he served as an instructor at West Point in the Department of Natural and Experimental Philosophy. Foreign After retiring from the Army in 1969, Parker became Commissioner of the New York State Department of Transportation from 1969 to 1972.
He died on May 27, 1994 in Tucson, Arizona.