John Wisniski Jr.

Actor, known for WWF Superstars, WWF Wrestling Challenge, Mid-Atlantic Championship Wrestling

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…