William Sierra
- Known for
- Acting
- Born
- August 11, 1957
- Birthplace
- Tampa, Florida, USA
William Matthew Sierra is an American former professional wrestling referee and manager better known by his ring name Bill Alfonso. He achieved his greatest success in Extreme Championship Wrestling in the mid-to-late 1990s. He is well known for the whistle that was almost always hanging around his neck, which he blew constantly during his wrestlers' matches In May 1995, he made his debut in Extreme Championship Wrestling as a "trouble-shooting referee".Introduced by Shane Douglas, he angered many ECW fans with strict enforcement of the rules and disqualifications of wrestlers for such ECW traditions as using steel chairs as weapons.n this role, he engaged in a feud with ECW founder Tod Gordon that resulted in several wrestling matches. Since the closing of ECW, Alfonso has appeared in several independent promotions. He worked one match in Xtreme Pro Wrestling as a referee. He has also worked in Elite Wrestling Entertainment as a referee and a manager,as well as managing wrestlers in Squared Circle Wrestling and Pro Wrestling Unplugged.In May 2007, he made his first appearance with Women's Extreme Wrestling, where he serves as a manager and as commissioner. On August 8, 2010, Alfonso took part in Total Nonstop Action Wrestling's ECW reunion show, Hardcore Justice, managing both Rob Van Dam and Sabu during their match against each other. On the following edition of TNA Impact!, the ECW alumni, known collectively as Extreme, Version 2.0 (EV 2.0), were assaulted by A.J. Styles, Kazarian, Robert Roode, James Storm, Douglas Williams and Matt Morgan of Ric Flair's Fourtune stable, who thought they didn't deserve to be in TNA. In October 2002, fellow manager Missy Hyatt sued Alfonso in a case televised on Judge Mathis. She accused Alfonso of damaging her Porsche and was awarded $500. Alfonso is not the only person in his family to have a career in the Professional Wrestling sport, his step brother, former Olympian Bob Roop also spent many years as a wrestler fighting all over the world under a variety of names and gimmicks while his cousin David Sierra has also enjoyed a long career in the ring including a stint in WCW as Fidel Sierra where he is remembered for a controversial feud with Hacksaw Jim Duggan. However, contrary to popular belief, Alfonso is not related to Mike Awesome with whom he spent time with in ECW. The confusion is thought to have stemmed from the fact that Awesome's real surname was Alfonso and the fact that he wrestled in Japan as The Gladiator, a name that Alfonso's real brother Bob Roop also used during his career.
Filmography

GCW: Joey Janela's Spring Break X 2026
as Bill Alfonso

The Ref Didn’t See It! 2025
as Bill Alfonso
- Battleground Championship Wrestling Presents ECW Reunion Show: A Tribute To The Extreme 2
Battleground Championship Wrestling Presents ECW Reunion Show: A Tribute To The Extreme 2 2024
as Bill Alfonso

The WRLD on GCW 2022
as Bill Alfonso
- Battleground Championship Wrestling
Battleground Championship Wrestling 2021
as Bill Alfonso
- WrestleCade Supershow 2019
WrestleCade Supershow 2019 2019
as Bill Alfonso

Barbed Wire City: The Unauthorized Story of Extreme Championship Wrestling 2013
as Himself

WWE: Undertaker 20-0 - The Streak 2012
as Bill Alfonso - Referee (archive footage)

ECW: Bloodsport The Most Violent Matches 2006
as Bill Alfonso

WWE: Blood Sport ECW - The Most Violent Matches 2006
Actor

Hardcore Homecoming 2005
as Bill Alfonso (Manager)

MLW War Games 2003
as Bill Alfonso

MLW Rise of The Renegades 2003
Actor

MLW Hybrid Hell 2003
as Bill Alfonso (Manager)

WWA The Revolution 2002
as Bill Alfonso
- ECW: The Best of Cactus Jack
ECW: The Best of Cactus Jack 2001
as Bill Alfonso
- MECW Inaugural Show
MECW Inaugural Show 2001
Actor

ECW Hardcore History 2001
as Bill Alfonso (Referee)

ECW Path of Destruction 2000
as Bill Alfonso (Manager)

ECW Anarchy Rulz 2000 2000
as Bill Alfonso (Manager)
- ECW Fan Cam: September 9, 2000
ECW Fan Cam: September 9, 2000 2000
as Bill Alfonso (Manager)
- ECW Fan Cam: August 25, 2000
ECW Fan Cam: August 25, 2000 2000
as Bill Alfonso (Manager)

ECW: Extreme Evolution 2000
as Bill Alfonso (Manager)

ECW Heat Wave 2000 2000
as Bill Alfonso (Manager)
- ECW Fan Cam: June 3, 2000
ECW Fan Cam: June 3, 2000 2000
as Bill Alfonso (Manager)

ECW Living Dangerously 2000 2000
as Bill Alfonso
- ECW Fan Cam: January 27, 2000
ECW Fan Cam: January 27, 2000 2000
as Bill Alfonso

ECW Guilty as Charged 2000 2000
as Bill Alfonso (Manager)
- ECW Fan Cam: December 17, 1999
ECW Fan Cam: December 17, 1999 1999
as Bill Alfonso (Manager)

ECW November to Remember 1999 1999
as Bill Alfonso (Manager)
- ECW Fan Cam: October 23, 1999
ECW Fan Cam: October 23, 1999 1999
as Bill Alfonso (Manager)
- ECW Fan Cam: October 15, 1999
ECW Fan Cam: October 15, 1999 1999
as Bill Alfonso (Manager)

ECW Anarchy Rulz 1999 1999
as Bill Alfonso (Manager)

ECW Heat Wave 1999 1999
as Bill Alfonso
- ECW Fan Cam: May 29, 1999
ECW Fan Cam: May 29, 1999 1999
as Bill Alfonso (Manager)

ECW Hardcore Heaven 1999 1999
as Bill Alfonso (Manager)

ECW CyberSlam 1999 1999
as Bill Alfonso (Manager)

ECW Living Dangerously 1999 1999
as Bill Alfonso (Manager)

ECW Crossing The Line 1999 1999
as Bill Alfonso
- ECW Fan Cam: February 6, 1999
ECW Fan Cam: February 6, 1999 1999
as Bill Alfonso (Manager)
- ECW Fan Cam: January 30, 1999
ECW Fan Cam: January 30, 1999 1999
as Bill Alfonso (Manager)

ECW House Party 1999 1999
as Bill Alfonso

ECW Guilty as Charged 1999 1999
as Bill Alfonso

ECW November To Remember 1998 1998
as Bill Alfonso (Manager)
- ECW Fan Cam: September 17, 1998
ECW Fan Cam: September 17, 1998 1998
as Bill Alfonso (Manager)

ECW Heat Wave 1998 1998
as Bill Alfonso

ECW A Matter of Respect 1998 1998
as Bill Alfonso (Manager)

ECW It Ain't Seinfeld 1998
as Bill Alfonso (Manager)

ECW Wrestlepalooza 1998 1998
as Bill Alfonso
- The Best of Shane Douglas
The Best of Shane Douglas 1998
as Bill Alfonso (Manager)
- ECW Fan Cam: March 7, 1998
ECW Fan Cam: March 7, 1998 1998
as Bill Alfonso (Manager)

ECW Living Dangerously 1998 1998
as Bill Alfonso
- The Best of The Eliminators
The Best of The Eliminators 1998
as Bill Alfonso (Manager)

ECW CyberSlam 1998 1998
as Bill Alfonso (Manager)

ECW House Party 1998 1998
as Bill Alfonso

ECW November to Remember 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: October 31, 1997
ECW Fan Cam: October 31, 1997 1997
as Bill Alfonso (Manager)

ECW As Good As It Gets 1997
as Bill Alfonso

ECW Hardcore Heaven 1997 1997
as Bill Alfonso (Manager)

ECW Born To Be Wired 1997
as Bill Alfonso
- ECW Heat Wave 1997
ECW Heat Wave 1997 1997
as Bill Alfonso (Manager)

ECW Wrestlepalooza 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: May 16, 1997
ECW Fan Cam: May 16, 1997 1997
as Bill Alfonso (Appearance)
- ECW Fan Cam: May 3, 1997
ECW Fan Cam: May 3, 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: May 2, 1997 (Barely Legal II)
ECW Fan Cam: May 2, 1997 (Barely Legal II) 1997
as Bill Alfonso (Manager)

ECW Barely Legal 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: April 4, 1997
ECW Fan Cam: April 4, 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: March 22, 1997
ECW Fan Cam: March 22, 1997 1997
as Bill Alfonso (Manager)
- ECW Fan Cam: February 14, 1997
ECW Fan Cam: February 14, 1997 1997
as Bill Alfonso (Manager)

ECW Holiday Hell 1996 1996
as Bill Alfonso
- ECW Fan Cam: November 23, 1996
ECW Fan Cam: November 23, 1996 1996
as Bill Alfonso (Manager)

ECW November to Remember 1996 1996
as Bill Alfonso
- ECW High Incident
ECW High Incident 1996
as Bill Alfonso (Manager)
- ECW Fan Cam: October 18, 1996
ECW Fan Cam: October 18, 1996 1996
as Bill Alfonso (Manager)

ECW Ultimate Jeopardy 1996 1996
as Bill Alfonso
- ECW When Worlds Collide 1996
ECW When Worlds Collide 1996 1996
as Bill Alfonso

ECW Natural Born Killaz 1996
as Bill Alfonso (Manager)

ECW The Doctor Is In 1996 1996
as Bill Alfonso
- ECW Fan Cam: July 28, 1996
ECW Fan Cam: July 28, 1996 1996
as Bill Alfonso

ECW Hardcore Heaven 1996 1996
as Bill Alfonso

ECW A Matter of Respect 1996 1996
as Bill Alfonso (Manager)
- ECW Fan Cam: May 10, 1996
ECW Fan Cam: May 10, 1996 1996
as Bill Alfonso (Manager)

ECW Hostile City Showdown 1996 1996
as Bill Alfonso

ECW Massacre on Queens BLVD 1996
as Bill Alfonso (Manager)

ECW Big Ass Extreme Bash 1996 1996
as Bill Alfonso

ECW Just Another Night 1996 1996
as Bill Alfonso

ECW CyberSlam 1996 1996
as Bill Alfonso

ECW Big Apple Blizzard Blast 1996
as Bill Alfonso
- ECW: January 27, 1996
ECW: January 27, 1996 1996
as Bill Alfonso (Appearance)

ECW Extreme Warfare Vol. 2 1996
as Bill Alfonso

ECW House Party 1996 1996
as Bill Alfonso (Manager)

ECW Holiday Hell 1995 1995
as Bill Alfonso (Manager)

ECW November to Remember 1995 1995
as Bill Alfonso
- ECW Fan Cam: September 23, 1995
ECW Fan Cam: September 23, 1995 1995
as Bill Alfonso (Referee)

ECW Gangstas Paradise 1995 1995
as Bill Alfonso (Troubleshooting Referee)
- ECW Sunshine State Slaughter
ECW Sunshine State Slaughter 1995
as Bill Alfonso (Troubleshooting Referee)

ECW Heat Wave 1995 1995
as Bill Alfonso (Troubleshooting Referee)

ECW Hardcore Heaven 1995 1995
as Bill Alfonso (Troubleshooting Referee)

ECW Mountain Top Madness 1995
as Bill Alfonso

ECW Barbed Wire, Hoodies and Chokeslams 1995
as Bill Alfonso (State Appointed Referee)

ECW Enter the Sandman 1995 1995
as Bill Alfonso (Troubleshooting Referee)

Bret "Hit Man" Hart 1994
as Bill Alfonso

WWE Bloopers Bleeps and Bodyslams 1994
as Bill Alfonso

WWE Bashed in the USA 1993
as Bill Alfonso
Credits from TMDB.