Clausen taught in public school for five years and was from 1967 to 1972 an assistant professor at Nicholls State University in Thibodaux in Lafourche Parish, Louisiana. From 1972 to 1976, Clausen was an assistant superintendent, with duties in special education, under superintendent Louis J. Michot. Clausen first ran for superintendent in the 1979 nonpartisan blanket primary but lost in the general election to the Democratic incumbent J. Kelly Nix, a native of West Carroll Parish in northeastern Louisiana. Clausen used a picture of a school bus on his campaign posters. He promised when elected to reform the educational system and vowed not to place blame unduly on classroom teachers. Hed stressed a "common-sense" approach to education, with emphasis on basic knowledge, classroom discipline, vocational programs, and teacher training. In the primary election held on October 22, 1983, Clausen handily unseated former opponent Nix in a two-candidate field. The Louisiana Secretary of State's office does not give the statewide results of this race on its website, but the outcome is provided in the returns for the individual parishes, most of which supported Clausen. In this same election, Edwin Edwards won his third nonconsecutive term as governor by handily unseating the Republican incumbent David C. Treen. Superintendent Clausen worked to implement more rigorous graduation requirements and expanded the elective subjects offered to include computer literacy, the arts, and foreign languages. He advocated for the expansion of professional opportunities for educators. He coordinated the movement of the education department into the Louisiana Civil Service system. Clausen worked to enhance the process of school accreditation. He also provided the transition to an appointed superintendency beginning in 1988 under the administration of Edward's second successor, Governor Buddy Roemer. Clausen was a member of the Louisiana Board of Commerce and Industry during the administration of Republican Governor Murphy J. "Mike" Foster, Jr., like Clausen a native of St. Mary Parish. For the last two years of his life, Clausen was a special education teacher at Valley Park Alternative School in Baton Rouge. Upon his death of cancer in Baton Rouge at the age of sixty-two, the Louisiana State Senate read a concurrent resolution in his honor. Eleven scholarships in the amount of $500 each were issued in 2004 in Clausen's name by the University of Louisiana System. Clausen and his sons are interred at Roselawn Memorial Park and Mausoleum in Baton Rouge.