A four-time SCCA Road Racing Champ, Hansgen participated in two Formula One Grands Prix, debuting on October 8, 1961, at Watkins Glen, New York. He scored a total of two championship points. In 1964 he raced the MG Liquid Suspension Special, an Offenhauser-powered car, for Kjell Qvale, at the Indianapolis 500. He finished 13th in that race. He raced there again in 1965, in the MG-Huffaker-Offenhauser, when he finished 14th.