Education
In 1924 he finished sixth in the 1500 m. He failed to reach the final in this event in 1928, but finished fifth in the 800 m event.
In 1924 he finished sixth in the 1500 m. He failed to reach the final in this event in 1928, but finished fifth in the 800 m event.
In 1926 Hahn was part of the United States 4×880 yd relay team that broke the world record. After retiring from competitions Hahn worked as athletics coach, with Gil Dodds among others
Earlier in 1928 Hahn won the 800 m race at the United States Olympic trials, which were combined with Amateur Athletic Union Championships that year, setting a new world record at 1:51.4, but the record was not ratified by the IAAF. Hahn won Amateur Athletic Union titles in the mile in 1926 and in the 1,000 yd in 1925 and 1927.