Probation officer Ramsey County Juvenile Court, St. Paul, 1954-1957. Superintendent Woodview Detention Home, 1957-1963. Associate Firestone, Fink, Krawetz, Miley, O'Neill, 1963-1967.
Partner Firestone Fink, Krawetz, Miley, Maas and Noonan, 1967-1970, Magistad & Noonan, St. Paul, 1971-1975. Owner James C. Noonan and Associates, since 1975.
Member advisory board Home of Good Shepherd, St. Paul, 1958-1974. Member citizen advisory board Detention and Corrections Authority, St. Paul, 1966-1980. Member American Bar Association, Minnesota State Bar Association, Ramsey County Bar Association, St. Paul Amateur Radio Club, American Radio Relay League.