He was then a Chief Assistant United States Attorney for the Eastern District of Michigan until 1970, going on to serve as the United States Attorney for the Eastern District of Michigan until 1976.
[2] On April 26, 1976, Guy was nominated by President Gerald Ford to a seat on the United States District Court for the Eastern District of Michigan vacated by Judge Frederick William Kaess.
Guy was confirmed by the United States Senate on May 11, 1976, and received his commission the following day.
His service terminated on October 17, 1985, due to elevation to the Sixth Circuit.
[2] On July 23, 1985, President Ronald Reagan nominated Guy to a new seat on the United States Court of Appeals for the Sixth Circuit created by 98 Stat.