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

Raw
2008
All Elite Wrestling: Dynamite
2020
WWF Superstars
1986
WWF Wrestling Challenge
1986
WWE Saturday Night's Main Event
1985
WWF All-Star Wrestling
1979
WWE Old School
1975
Mid-Atlantic Championship Wrestling
1982
Clash of the Champions
1992
Biography: WWE Legends
2021
Tuesday Night Titans
1984
WWE's Most Wanted Treasures
2021

FILMOGRAPHY

All
Movies
TV
Acting
125
2025
Midnight Massacre
as Caepio
2021
Biography: WWE Legends
as Greg "The Hammer" Valentine
2021
WWE's Most Wanted Treasures
as Greg "The Hammer" Valentine
2020
Chris Jericho's 30th Anniversary Celebration
as Greg "The Hammer" Valentine
2020
All Elite Wrestling: Dynamite
as Greg Valentine
2020
Undertaker: The Last Ride
as Greg Valentine (archive footage)
2019
350 Days
as Self
2019
Headstrong
as Self
2016
WWE: The U.S. Championship: A Legacy of Greatness
as Greg 'The Hammer' Valentine (archive footage)
2015
Behind the Ropes: The Greatest Fraternity in the World
as Himself
2015
At What Cost? Anatomy of Professional Wrestling
as Himself
2014
WWE: 150 Best Pay-Per-View Matches, Vol 1
as Himself
2012
WWE: Starrcade - The Essential Collection
as Himself
2011
Timeline The History of WWE – 1985 – As Told By Greg Valentine
as Himself
2011
JCW Legends and Icons
2008
WWE: The History Of The Intercontinental Championship
as Himself
2008
Raw
as Greg "The Hammer" Valentine
2006
WWE: The History Of The WWE Championship
2005
World Wrestling Legends: 6:05 - The Reunion
as Greg Valentine
2005
The Greatest Wrestling Stars of the '80s
as Self
2004
WWE Hall of Fame 2004
as Self
1999
Heroes of Wrestling
as Greg "The Hammer" Valentine
1997
WCW World War 3 1997
as Greg "The Hammer" Valentine
1996
AWF Warriors of Wrestling
as Greg "The Hammer" Valentine
1994
WWE Royal Rumble 1994
as Greg "The Hammer" Valentine
1993
WWE Survivor Series 1993
as The Blue Knight
1992
WWE SuperTape: Volume 5
as Greg "The Hammer" Valentine
1992
WCW Beach Blast
as Greg "The Hammer" Valentine
1992
WCW Clash of The Champions XX: 20th Anniversary
as Greg "The Hammer" Valentine
1992
WWE Royal Rumble 1992
as Greg "The Hammer" Valentine
1992
WCW WrestleWar 1992
as Greg "The Hammer" Valentine
1992
The Immortal Hulk Hogan
as Greg Valentine
1992
Clash of the Champions
as Greg "The Hammer" Valentine
1991
WWE WrestleFest '91
as Greg "The Hammer" Valentine
1991
WWE Mega Matches
as Greg "The Hammer" Valentine
1991
WWE Rampage '91
as Greg "The Hammer" Valentine
1991
WWE WrestleMania VII
as Greg "The Hammer" Valentine
1991
WWE Royal Rumble 1991
as Greg "The Hammer" Valentine
1991
WWE SummerSlam 1991
as Greg "The Hammer" Valentine
1991
WWE Superstars & Stripes Forever: The March to WrestleMania VII
as Greg "The Hammer" Valentine
1991
WWE U.K. Rampage 1991
as Greg "The Hammer" Valentine
1991
WWE Funniest Moments
as Greg "The Hammer" Valentine
1990
Battle of the WWE Superstars
as Greg Valentine
1990
WWE Hottest Matches
as Greg "The Hammer" Valentine
1990
WWE SuperTape: Volume 2
as Greg "The Hammer" Valentine
1990
WWE Survivor Series 1990
as Greg "The Hammer" Valentine
1990
WWF/AJPW/NJPW Wrestling Summit
1990
WWE The Ultimate Challenge Special: The March to WrestleMania VI
as Greg "The Hammer" Valentine
1990
WWE Royal Rumble 1990
as Greg "The Hammer" Valentine
1990
Wrestling Superheroes
as Greg "The Hammer" Valentine
1989
WWE WrestleMania V
as Greg "The Hammer" Valentine
1989
Demolition: Witness the Power
as Greg "The Hammer" Valentine
1989
The Ultimate Warrior
as Greg "The Hammer" Valentine
1989
Fan Favorites
as Greg Valentine
1989
The Best of the WWF: volume 20
as Greg "The Hammer" Valentine
1989
WWE Maple Leaf Wrestling: April '89
as Greg "The Hammer" Valentine
1989
WWE Los Angeles Wrestling: January '89
as Greg "The Hammer" Valentine
1989
WWE Wrestling at The Meadowlands: May '89
as Greg "The Hammer" Valentine
1989
WWE Royal Rumble 1989
as Greg "The Hammer" Valentine
1989
WWE Survivor Series 1989
as Greg "The Hammer" Valentine
1989
WWE SummerSlam 1989
as Greg Valentine
1988
WWE Survivor Series 1988
as Greg "The Hammer" Valentine
1988
The Best of the WWF: volume 16 Around the World
as Greg "The Hammer" Valentine
1988
WWE U.K. Rampage 1988
as Greg "The Hammer" Valentine
1988
WWE Los Angeles Wrestling: December '88
as Greg "The Hammer" Valentine
1988
WWE Maple Leaf Wrestling: April '88
as Greg "The Hammer" Valentine
1988
WWE Maple Leaf Wrestling: July '88
as Greg "The Hammer" Valentine
1988
WWE Wrestling at The Meadowlands: September '88
as Greg "The Hammer" Valentine
1988
WWE WrestleMania IV
as Greg "The Hammer" Valentine
1988
Macho Madness
as Greg "The Hammer" Valentine
1988
Brutus "The Barber" Beefcake
as Greg "The Hammer" Valentine
1988
WWE Saturday Night's Main Event
as Greg "The Hammer" Valentine
1987
WWE WrestleMania III
as Greg "The Hammer" Valentine
1987
Bob Uecker's Wacky World of Sports
as Greg "The Hammer" Valentine
1987
The Best of the WWF: volume 10
as Greg "The Hammer" Valentine
1987
The Best of the WWF: volume 11
as Greg "The Hammer" Valentine
1987
The Best of the WWF: volume 14
as Greg "The Hammer" Valentine
1987
WWE Houston Wrestling: October '87
as Greg "The Hammer" Valentine
1987
WWE Houston Wrestling: December '87
as Greg "The Hammer" Valentine
1987
WWE Maple Leaf Wrestling: January '87
as Greg "The Hammer" Valentine
1987
WWE Maple Leaf Wrestling: June '87
as Greg "The Hammer" Valentine
1987
WWE Wrestling at The Meadowlands: January '87
as Greg "The Hammer" Valentine
1987
WWE Survivor Series 1987
as Greg Valentine
1987
Wrestling's Most Embarrassing Moments
as Greg "The Hammer" Valentine
1987
WWF Wrestling Challenge
as Greg "The Hammer" Valentine
1986
WrestleMania II
as Greg "The Hammer" Valentine
1986
The British Bulldogs
as Greg Valentine
1986
Ricky "The Dragon" Steamboat
as Greg "The Hammer" Valentine
1986
The Best of the WWF: volume 7
as Greg "The Hammer" Valentine
1986
The Best of the WWF: volume 5
as Greg "The Hammer" Valentine
1986
The Best of the WWF: volume 9
as Greg "The Hammer" Valentine
1986
WWE Houston Wrestling: October '86
as Greg "The Hammer" Valentine
1986
Tag Team Champions
as Greg Valentine
1986
WWE The Big Event
as Greg "The Hammer" Valentine
1986
Inside the Steel Cage
as Greg "The Hammer" Valentine
1986
WWE Grudge Match
as Greg "The Hammer" Valentine
1986
WWF Wrestling Challenge
as Greg Valentine
1986
WWE Saturday Night's Main Event
1986
WWF Superstars
as Greg "The Hammer" Valentine
1985
WrestleMania
as Greg "The Hammer" Valentine
1985
The Best of the WWF: volume 4
as Greg "The Hammer" Valentine
1985
Most Unusual Matches
as Greg "The Hammer" Valentine
1985
Hulkamania 1
as Greg Valentine
1985
WWE Maple Leaf Wrestling: April '85
as Greg "The Hammer" Valentine
1985
WWE Maple Leaf Wrestling: September '85
as Greg "The Hammer" Valentine
1985
WWE Maple Leaf Wrestling: October '85
as Greg "The Hammer" Valentine
1985
WWE Maple Leaf Wrestling: December '85
as Greg "The Hammer" Valentine
1985
The WWF's Amazing Managers
as Greg 'The Hammer' Valentine
1985
WWE Saturday Night's Main Event
as Greg Valentine
1985
Tuesday Night Titans
as Greg Valentine
1984
WWE Maple Leaf Wrestling: September '84
as Greg "The Hammer" Valentine
1984
WWE Maple Leaf Wrestling: October '84
as Greg "The Hammer" Valentine
1984
WWE The Brawl to End it All
as Greg "The Hammer" Valentine
1984
NWA Boogie Jam
as Greg Valentine
1984
Tuesday Night Titans
as Greg "The Hammer" Valentine
1984
WCW Arena Shows
as Greg Valentine
1983
NWA Starrcade 1983
as Greg "The Hammer" Valentine
1983
NWA The Final Conflict
as Greg Valentine
1983
NWA The Race to Starrcade
as Greg Valentine
1982
NWA Sam Muchnick Retirement Show
as Greg Valentine
1982
Mid-Atlantic Championship Wrestling
as Greg Valentine
1981
WWF All-Star Wrestling
as Greg 'The Hammer' Valentine
1981
WWE Old School
as Greg "The Hammer" Valentine
1979
WWF All-Star Wrestling
as Greg Valentine
1975
WWE Old School
as Greg Valentine