 He trained Boyd Melson, who won the gold medal at the 2004 World Military Boxing Championships in the 69 kg weight class and fought professionally at light middleweight until his retirement in 2016.Gamache was hired by Team Sauerland, and trained the Danish super middleweight contender Patrick Nielsen.Gamache is the current trainer of Swedish boxer Otto Wallin, who faced the former unified heavyweight world champion Tyson Fury on September 14, 2019.