Guillaume started sailing on the family boat, before taking part in international regattas in Optimist. He finished twice in the swiss Laser 4.7 championship. He then sailed with his brother in the 420 and 470 classes, and also finished second in the European Junior Match Race championship in 2015. He also sails the Moth occasionally. Guillaume also represented Team Tilt and Switzerland at the the last Red Bull Youth America’s Cup in 2017, where the team finished 3rd.
Function in the team :
Tactician Red Bull Youth America's Cup
5 December 1993 in Geneva