Stephen “The Fight Professor” Quadros (born in Santa Cruz, California, United States) is an American broadcaster, specializing in play-by-play and color commentary, as well as interviews for the combat sports genre on cable, pay-per-view and DVD. His resume encompasses over 100 international mixed martial arts events since 1997. A long time martial arts practitioner and devotee, Quadros was the original host and play-by-play commentator for the PRIDE Fighting Championships alongside Bas Rutten (iN Demand PPV, Fox Sports Net, DVD, Japan) and has done play-by-play and color commentary for events such as the International Fight League (Fox Sports Net, USA), Cage Rage (SKY Sports, DVD, England), Hardcore Championship Fighting (BELL ExpressVU, DVD, Canada), World Extreme Cagefighting (HDNet, DVD, USA), K-1 World Grand Prix 2000 (ESPN, DVD, Japan), Rumble on the Rock (iN Demand PPV, USA), Too Hot To Handle (DVD, Netherlands), Kuwait Shidokan Jitsu Warriors War 1 (DVD, Kuwait), APEX Championship Fighting (TSN, DVD, Canada) and King of the Cage (DVD, USA). From 2007 to 2011, Stephen worked for Showtime Sports (premium cable, USA) where he called the action for (Strikeforce, Strikeforce Challengers, as well as ShoXC and EliteXC. Quadros was reunited with his PRIDE broadcasting partner Bas Rutten as part of the UFC Undisputed 3 video game (PlayStation, Xbox). When the game is played in "PRIDE Mode", Quadros and Rutten provide the commentary duties.Additionally Quadros was the host, along with San Diego sports radio personality Jeff Dotseth, of Clinch Gear Radio, a mixed martial arts (MMA) related program, that was broadcast weekly on Sirius XM (2010–2012). Clinch Gear Radio was also the voice of mixed martial arts for AFN, American Forces Network. He was also the host for the 2005 and 2006 Black Belt Hall of Fame Awards at Universal Studios. Working alongside his longtime Showtime cohort Mauro Ranallo, Quadros served as an analyst-color commentator and interviewer for GLORY World Series on CBS Sports Network, Spike TV, ESPN 2 (2012-2015). GLORY showcased the talents of the world's greatest kickboxers, such as four time K-1 World Grand Prix champion Semmy Schilt, three time K-1 World Grand Prix champion Peter Aerts, three time K-1 World Grand Prix champion Remy Bonjasky and two time K-1 World MAX champion Giorgio Petrosyan. Quadros also called the action on ShinZo: Fight Sport in Guatemala City, Guatemala with UFC Hall of Famer Stephan Bonnar. On August 1, 2014, Quadros was inducted into the Masters Hall of Fame for "Outstanding Contributions To The Martial Arts". The award ceremony was held in conjunction with the 50th anniversary of the Long Beach International Karate Championships, Ed Parker's tournament that previously showcased Bruce Lee, Chuck Norris, Joe Lewis, Mike Stone, Benny Urquidez, Bill Wallace and many more. Then on November 16, 2014, Quadros was inducted into the Legends of MMA Hall of Fame along with Art Davie, Big John McCarthy, Pat Miletich, Fedor Emelianenko and Rickson Gracie.After working practically non-stop for 15 years as a broadcaster-fight commentator, Quadros is very enthusiastic about resuming his acting career in Southern California. He has studied acting with William Alderson, Stella Adler, Milton Justice, Mark Haining (of Peggy Feury's "Loft" studio), Arthur Mendoza, Scott Bernstein's Comedy Plus and Michelle Danner (Larry Moss Studio).