Born and raised in Stockton, California, Guntert has been involved in an array of sports . In high school, he played wide receiver in football and ran the 110 high hurdles, 300 intermediate hurdles, 4×100 relays, 4×400 relays and the 400 sprint. Guntert continued his athletic pursuits at UC Santa Barbara and UC Davis, as a member of the rowing team. In addition, he has been active in grass and sand volleyball tournaments. After receiving his engineering degree from UC Davis, he made some life changes, and got sober and focused on becoming healthy, fit, and living a productive lifestyle. He became a Be Non Human sponsored athlete, ran his first ever marathon and has a beautiful wife Kate and a 10 month old daughter Eden Rose.