Otto Kaiser teamed up with Lilly Scholz in pairs, becoming Austrian Champions for the first time in 1924 and repeating the feat from 1927-29. The couple competed in the World Championships from 1925-29 taking a medal each time: bronze in 1925, silvers in 1926-28, and finally the gold in 1929 at Budapest. One of their main competitors was the couple Andrée Joly / Pierre Brunet, who beat them at the 1928 Winter Olympics.
When Scholz married and began to skate as Gaillard with (non-Olympian) Willy Petter, Kaiser later tried pairs skating again with (non-Olympian) Hansi Kast. He was unable, however, to repeat his earlier successes. At the 1931 World Championships they finished in eighth and last place. In 1933, they finished third at the national championships and subsequently turned professional.