Arn practiced law in
Wichita, Kansas, until he enlisted in the
U.S. Navy. He served as a lieutenant aboard an aircraft carrier that fought in
Iwo Jima. Returning to his law practice, Arn became active in local politics and served as Chairman of the Wyandotte County Republicans. From 1947 to 1949, he served as
Attorney General of Kansas, and as a justice of the
Kansas Supreme Court from 1949 to 1951. Arn won the Republican gubernatorial nomination was elected
Governor of Kansas in 1950, re-elected in 1952, and served from 1951 to 1955. This made him the first Governor of Kansas born in the 20th century. During his tenure, the Kansas Turnpike Authority was established, workman's compensation benefits were improved, the Kansas Veteran's Commission was formed, a state department of administration was organized, and the destructive floods of 1951 were dealt with. Arn left office on January 10, 1955, and returned to
Wichita to practice law. He was a delegate to the
Republican National Convention in 1960. He ran unsuccessfully for the
United States Senate in 1962. ==Death==