 Neumann won the national titles in 400 m (1922 and 1924), 4 × 400 m relay (1927–28) and 400 m hurdles (1928).Besides running he played four international football matches and then worked as a football coach for SV Waldhof Mannheim and SV Amicitia 09 Viernheim.In 1939 Neumann graduated with a diploma in physical education.