He is best known for his tenure with World Championship Wrestling under the ring name Robbie Rage and as a part of the tag team High Voltage with Kenny Kaos.
Knapik grew up in Plymouth, Massachusetts and played a variety of sports while growing up, including baseball, hockey, and soccer.
Upon completion of their training, Knapik and Stasiowski debuted on WCW television under the ring names Ruckus and Kaos, respectively, and they formed the tag team High Voltage.
Upon their return to the United States, Knapik joined Tim Catalfo's Obake Gym and befriended Yuji Nagata, who was also wrestling in WCW.
On the December 17, 1998, episode of Thunder, Rage, while sporting a brace to nurse his arm injury, returned to confront Kaos over the matter of allying with Steiner rather than himself to claim the title.
He remained with the WWC until September 14, 2007, when he wrestled his final match during the promotion's Septiembre Negro Tour.