sentences:  He became a Foreign affairs officer in the United States Department of State from 1951 to 1953.Warren practiced law in Elkhorn, Wisconsin, from 1956 to 1957, and then moved to Green Bay, Wisconsin, where he practiced law from 1957 to 1959.He was an assistant district attorney of Brown County, Wisconsin from 1959 to 1961, and became district attorney from 1961 to 1965.