Southworth was born in
Madison, Wisconsin, and was adopted when he was six weeks old. Southworth has three sisters. He grew up in
Santa Cruz, California. He liked
surfing as a hobby, as well as playing
football and
basketball, and
track. After graduating from
Soquel High School, Southworth continued to
Cabrillo College, then
UC Davis, playing basketball at both. His initial interest in martial arts was sparked after seeing
Royce Gracie at
UFC 1 and
UFC 2. While Southworth was looking for a sport to stay fit, a friend invited him to a jiu-jitsu class in a nearby gym. Instantly hooked by the discipline, Southworth joined
Cesar Gracie Jiu-Jitsu academy before moving on to Gracie Systems, which was formed after Cesar's cousin
Ralph Gracie moved stateside. Subsequently, Ralph opened his own academy in
Mountain View, California, where Southworth continued teaching and training jiu-jitsu. Southworth grew interested in taking a no-holds-barred bout, which Gracie disapproved of, leading to Southworth's departure from the academy. Subsequently he joined
American Kickboxing Academy, which at the time had no proper Brazilian jiu-jitsu program, so he took the responsibility of teaching the discipline. == Mixed martial arts career ==