[2][3] During his career Hänni won seven individual national titles (1959, 1962, 1964, 1965, 1969–71) and took part in twelve European and three World Championships.

Besides competing in judo, he also acted as a referee, at the national (since 1965), European (since 1974) and world level (since 1985).

[4] In 1972 he opened his own judo club in his native Delémont, which he ran until 1995.

In parallel, he trained the national junior and senior teams and acted as vice-president of the Swiss Judo Association.

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