Born in Nevis, Minnesota, Renner was in the United States Army during World World War II, from 1943 to 1946. He received a Bachelor of Arts from Saint John"s University (Minnesota) in 1947 and a Juris Doctor from Georgetown University Law School in 1949. He was in private practice in Walker, Minnesota from 1949 to 1969.
He was a Minnesota state representative from 1957 to 1969.
He was the United States Attorney for the District of Minnesota from 1969 to 1977. Renner was a federal judge on the United States District Court for the District of Minnesota.
Renner was nominated by President Jimmy Carter on November 30, 1979, to a new seat created by 92 Statistics 1629. He was confirmed by the United States Senate on February 20, 1980, and received his commission the same day.
He assumed senior status on February 22, 1992.
Renner served in that capacity until his death. United States Magistrate Judge for the United States. District Court for the District of Minnesota, 1977–1980
He died in Roseville, Minnesota.