He received a J.D. in 1962 from the University of Michigan Law School. He then served in the United States Navy from 1962 to 1966, in the Judge Advocate General's Corps. Yock entered private practice in 1966, in St. Paul, Minnesota.
In 1969 he joined the General Services Administration as Chief Counsel of the National Archives and Record Service, becoming Executive Assistant and Legal Advisor to the Administrator in 1970 and Assistant General Counsel from 1972 to 1977. In 1977, Yock became a trial judge for the United States Court of Claims. On October 1, 1982, became a judge of the United States Court of Federal Claims by operation of law, following passage of the Federal Courts Improvement Act of 1982.
On June 20, 1983, Yock was nominated by President Ronald Reagan to a full fifteen year term on the court. He was confirmed by the United States Senate on August 4, 1983, and received his commission on August 5, 1983. Federal Trade Commissioner Maureen Ohlhausen was one of Yock's law clerks from 1991 to 1992.
Yock transitioned to senior status on August 5, 1998, and is currently inactive.