John Wisniski Jr.
Acting
John Wisniski, Jr. is an American professional wrestler, better known as Greg "The Hammer" Valentine. He is the son of wrestler Johnny Valentine. In the course of his career, which has spanned over four decades, Valentine has held more than 40 championships, including the NWA United States Heavyweight Championship and the WWE Intercontinental Championship. An alumnus of WWE and World Championship Wrestling, he was inducted to the WWE Hall of Fame in 2004.
Known for
2025Midnight Massacre
Caepio
2020Chris Jericho's 30th Anniversary Celebration
Greg "The Hammer" Valentine
2019350 Days
Self
2016WWE: The U.S. Championship: A Legacy of Greatness
Greg 'The Hammer' Valentine (archive footage)
2015Behind the Ropes: The Greatest Fraternity in the World
Himself
2015At What Cost? Anatomy of Professional Wrestling
Himself
2012WWE: Starrcade - The Essential Collection
Himself
2011Timeline: The History of WWE – 1985 – As Told By Greg Valentine
Himself
2008WWE: The History Of The Intercontinental Championship
Himself
2006WWE: The History Of The WWE Championship
2005The Greatest Wrestling Stars of the '80s
Self
2004WWE Hall of Fame 2004
Self
1999Heroes of Wrestling
Greg "The Hammer" Valentine
1997WCW World War 3 1997
Greg "The Hammer" Valentine
1994WWE Royal Rumble 1994
Greg "The Hammer" Valentine
1993WWE Survivor Series 1993
The Blue Knight
1992WWE SuperTape: Volume 5
Greg "The Hammer" Valentine
1992WCW Beach Blast
Greg "The Hammer" Valentine
1992WCW Clash of The Champions XX: 20th Anniversary
Greg "The Hammer" Valentine
1992WWE Royal Rumble 1992
Greg "The Hammer" Valentine
1992WCW WrestleWar 1992
Greg "The Hammer" Valentine
1992The Immortal Hulk Hogan
Greg Valentine
1991WWE WrestleFest '91
Greg "The Hammer" Valentine
1991WWE Mega Matches
Greg "The Hammer" Valentine