Soszynski was born in Stalowa Wola, Poland, where he was raised until the age of ten, when his family moved to Winnipeg, Manitoba, Canada. Soszynski played football and soccer for Maples Collegiate, but later turned to weight training at the age of 16 before transitioning into bodybuilding and later professional wrestling. During career in professional wrestling, which he began at the age of 21 and ended at the age of 25, Soszynski learned various judo techniques as well as submissions from fellow professional Wrestler Bad News Brown, a bronze medalist in Judo at the 1976 Olympic games. After this, Soszynski began to pursue a career in mixed martial arts and also trained in Brazilian jiu-jitsu under black belt and gym owner, Rodrigo Munduruca, in Winnipeg. Soszynski also worked as a houseman at the Fairmont Winnipeg Hotel and as a promoter of local MMA events in Manitoba.
Soszynski faced Goran Reljic on November 13, 2010 at UFC 122. He won the fight via unanimous decision.
Soszynski/Pokrajac took place on December 10, 2011 at UFC 140. Soszynski was staggered early on with a straight right from Pokrajac, who followed him to the ground where he landed several shots that finished Soszynski off, resulting in a KO loss. Soszynski was unresponsive for a few minutes after the fight. In a video blog by Dana White, President of the UFC, leading up to UFC 141, there was footage of Soszynski following his loss to Pokrajac and was seen claiming that he is retiring from MMA. Later, he claimed he has no memory of what occurred in the video and says his Future in MMA fighting will be dependent upon what his doctors say.
Soszynski then stepped in as a replacement for an injured Matt Hamill to fight Brandon Vera at UFC 102 in Portland, Oregon. Soszynski lost via unanimous decision, bringing his UFC record down to 3–1.
Soszynski made an appearance in the movie Here Comes the Boom as a top MMA fighter in the UFC by the name of Ken "The Executioner" Dietrich. He then landed a major role in the movie Tapped Out (2014). Soszynski has a role in the 2017 movie Logan.
