- Born: 08/20/1987 in Vienna, Austria
- Birthname: Walter Hahn
- Height & Weight: 6'4", 297 Ib
- WWE/NXT United Kingdom Championship
- Progress Atlas Championship (3 times)
- Progress World Championship
He has appeared in a number of independent promotions around the world, most notably Westside Xtreme Wrestling, Pro Wrestling Guerrilla (PWG), where he is a former one-time PWG World Champion, and Progress Wrestling, where he is the current Progress World Champion in his first reign. He won the WWE United Kingdom Championship when he defeated Pete Dunne at NXT TakeOver: New York. On the episode of NXT UK before the 2020 Royal Rumble, Walter was presented with the renamed NXT UK Championship.
Other Notable Achievements: Defiant Internet Championship, EWP Tag Team Championship – with Michael Kovac, Infinity Trophy, GSW Tag Team Championship – with Robert Dreissker, OTT Championship, PWF North-European Championship, PWG World Championship, wXw Unified World Wrestling Championship (3 times), wXw World Tag Team Championship (3 times) – with Robert Dreissker (1), Zack Sabre Jr. (1), and Timothy Thatcher (1), 16 Carat Gold Tournament (2010), wXw World Tag Team Tournament (2015) – with Zack Sabre Jr, World Tag Team League (2017) – with Timothy Thatcher