He won the individual large hill event at the 1952 Olympics and 1952 Holmenkollen ski festival and placed third at the 1950 World Championships.

As a junior Bergmann won the national title and the ski jumping competition in Holmenkollen in 1948.

In 1952 he returned to Norway and won the Olympic gold medal, the Holmenkollen and the national championships.

In 1958 he was included to the 1958 World Championships team, after he unexpectedly won the national title, but he withdrew again, for unknown reasons.

After that he returned to Trondheim and spent the rest of his active life on maintaining the local ski museum.