Served on the Iowa Supreme Court from July 19, 1965, until he retired June 14, 1978. He served as Senior Judge from 1979 to 1987.
Born June 14, 1906, in Warren County, Illinois. He was graduated from the University of Notre Dame in 1929 and from the University of Minnesota Law School in 1931. In 1931 he entered the general practice of law at Mason City where he continued until coming on the Supreme Court. He served five terms as County Attorney of Cerro Gordo County and later was United States Attorney for the Northern District of Iowa from November 11, 1952, to June 1, 1953.
Since his retirement Justice Mason has served the Supreme Court in various capacities by special assignment.