He was acting director of the Disputes Division of the Tenth Region of the National War Labor Board from 1942 to 1943.
He was a United States Naval Reserve Lieutenant during World War II, from 1943 to 1946.
He was an assistant to president and general counsel of United States Grant Export-Import, Ltd. in Los Angeles, California from 1946 to 1948.
He was confirmed by the United States Senate on July 29, 1971, and received his commission the same day.
Lydick served in that capacity until his death on December 17, 1995, in Laguna Beach, California.