William "Bill" Viola Jr. (born April 9, 1977) is an international martial arts champion, promoter and author.

[9][14][15][16] Viola graduated summa cum laude from the University of Pittsburgh in 1999 and moved to Hollywood, California, to work in the entertainment industry.

[17][18] The company's signature event is the annual self-titled Kumite Classic, a multi-sport and fitness expo in Pittsburgh, Pennsylvania.

[4][1][18][21][22] The book chronicles CV Productions, Inc., the first mixed martial arts league in America[22] and the introduction of the Tough Guy Contest.

[10][23][24] Godfathers of MMA is the subject of the documentary film Tough Guys (2016) produced by MinusL Inc.[24][25][26] He established Kumite Quarterly Magazine in 2003.

As a freelance journalist, he was contracted by Sport Karate Magazine to cover The National Black Belt League World Games on location in Canada, Mexico and across the United States.