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Ryan served as a law specialist in the United States Navy and was assigned to the Judge Advocate General and duty with the United States Marine Corps. Upon his release from active duty in 1960, he continued to serve in the Judge Advocate General's Corps of the United States Naval Reserve and, in 1992, retired from the Naval Reserve as a military judge with the rank of captain.
He was in private practice of law in Detroit from 1960 to 1963. He was in private practice of law in Redford, Michigan from 1963 to 1966. He was a justice of the peace in Redford from 1963 to 1966. He was a judge of the circuit court for the Third Judicial Circuit, Michigan from 1966 to 1975. He has been an adjunct professor of law at the University of Detroit since 1974.