[1] Born in Versegères in the canton of Valais, Collombin made his first World Cup top ten finish at age 20 in December 1971 with a seventh place in the downhill at Val-d'Isère, France.

In January 1974, Collombin won the month's four downhills in consecutive weeks, which included the two classics: the Lauberhorn at Wengen, Switzerland, and the Hahnenkamm at Kitzbühel, Austria.

The Swiss team won seven medals at the Olympics two years earlier in Japan, but managed just one at home, a bronze in the women's slalom (by Lise-Marie Morerod).

Collombin could not continue his January success; he fell in the downhill and did not finish, but he was 0.45 seconds behind winner David Zwilling before he did fall, maybe a to big margin to take the win.

Collombin attempted a comeback on 7 December 1975 at Val-d'Isère, but fell in the first training at the same jump as the year before and broke two vertebrae, being paralyzed for two days and ending his racing career.