[citation needed] He has been married to his wife Kathrin since 1994 and they have three sons: Marco (born 1995), Simon (b.

He is a Hauptfeldwebel (Sergeant First Class) in the German Bundeswehr..[citation needed] Groß started out as a cross-country skier but switched to biathlon at the age of 13.

In the biathlon competition at the 1992, 1994, and 1998 Winter Olympics, he won gold medals as part of the men's 4 × 7.5 km relay team.

[4] Groß took a total of 53 individual podium finishes in World Cup competition, including nine race wins.

[5] In August 2015 he became a senior coach for the Russian men's biathlon squad, agreeing a contract up to the 2017-18 season.