Jeffrey caught ice hockey fever at the age of 5 and wanted to be a goalie right from the start. He spent his training at the ZSC/GCK Lions Academy and became Swiss Elite A Junior Champion in the 2016/17 season. He has also already had a taste of the Swiss junior national team. Since the 2022-23 season, he has been a member of the ZSC Lions' 1st team in the National League. During his loan stint at HC Fribourg-Gottéron, he came into touch with kingnature and has consistently relied on the plant-based vital substances ever since: "I demand a lot from my mind and body and want to give something back with targeted nutritional supplements. With kingnature, I have a strong partner at my side - not only in terms of the high-quality products, but also the professional advice and outstanding service." Jeffrey has been playing in the Swiss League with EHC Olten since the 2024/25 season.