William Sierra

Acting

August 11, 1957 (69 years old)

Tampa, Florida, USA

107

Acting Credits

Biography

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 ma...

Known For

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

2024

as Bill Alfonso

The WRLD on GCW

2022

as Bill Alfonso

Battleground Championship Wrestling

2021

as Bill Alfonso

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)

8.8

WWE: Blood Sport ECW - The Most Violent Matches

2006

ECW: Bloodsport The Most Violent Matches

2006

as Bill Alfonso

Hardcore Homecoming

2005

as Bill Alfonso (Manager)

MLW War Games

2003

as Bill Alfonso

MLW Rise of The Renegades

2003

MLW Hybrid Hell

2003

as Bill Alfonso (Manager)

WWA The Revolution

2002

as Bill Alfonso

ECW: The Best of Cactus Jack

2001

as Bill Alfonso

4.8

MECW Inaugural Show

2001

ECW Hardcore History

2001

as Bill Alfonso (Referee)

8.3

ECW Guilty as Charged 2000

2000

as Bill Alfonso (Manager)

ECW Fan Cam: January 27, 2000

2000

as Bill Alfonso

ECW Fan Cam: June 3, 2000

2000

as Bill Alfonso (Manager)

ECW Fan Cam: August 25, 2000

2000

as Bill Alfonso (Manager)

ECW Fan Cam: September 9, 2000

2000

as Bill Alfonso (Manager)

ECW Heat Wave 2000

2000

as Bill Alfonso (Manager)

5.2

ECW Living Dangerously 2000

2000

as Bill Alfonso

ECW Path of Destruction

2000

as Bill Alfonso (Manager)

ECW Anarchy Rulz 2000

2000

as Bill Alfonso (Manager)

ECW: Extreme Evolution

2000

as Bill Alfonso (Manager)

ECW Fan Cam: May 29, 1999

1999

as Bill Alfonso (Manager)

ECW Fan Cam: October 15, 1999

1999

as Bill Alfonso (Manager)

ECW Fan Cam: January 30, 1999

1999

as Bill Alfonso (Manager)

ECW Fan Cam: February 6, 1999

1999

as Bill Alfonso (Manager)

ECW Fan Cam: December 17, 1999

1999

as Bill Alfonso (Manager)

ECW Fan Cam: October 23, 1999

1999

as Bill Alfonso (Manager)

ECW Crossing The Line 1999

1999

as Bill Alfonso

ECW House Party 1999

1999

as Bill Alfonso

ECW Guilty as Charged 1999

1999

as Bill Alfonso

ECW Living Dangerously 1999

1999

as Bill Alfonso (Manager)

ECW Hardcore Heaven 1999

1999

as Bill Alfonso (Manager)

ECW Anarchy Rulz 1999

1999

as Bill Alfonso (Manager)

ECW CyberSlam 1999

1999

as Bill Alfonso (Manager)

ECW November to Remember 1999

1999

as Bill Alfonso (Manager)

ECW Heat Wave 1999

1999

as Bill Alfonso

ECW Fan Cam: September 17, 1998

1998

as Bill Alfonso (Manager)

The Best of Shane Douglas

1998

as Bill Alfonso (Manager)

The Best of The Eliminators

1998

as Bill Alfonso (Manager)

ECW Fan Cam: March 7, 1998

1998

as Bill Alfonso (Manager)

ECW Wrestlepalooza 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 Heat Wave 1998

1998

as Bill Alfonso

9.5

ECW November To Remember 1998

1998

as Bill Alfonso (Manager)

ECW House Party 1998

1998

as Bill Alfonso

ECW CyberSlam 1998

1998

as Bill Alfonso (Manager)

ECW Living Dangerously 1998

1998

as Bill Alfonso

ECW Fan Cam: October 31, 1997

1997

as Bill Alfonso (Manager)

ECW Fan Cam: February 14, 1997

1997

as Bill Alfonso (Manager)

ECW Fan Cam: March 22, 1997

1997

as Bill Alfonso (Manager)

ECW Barely Legal 1997

1997

as Bill Alfonso (Manager)

ECW Wrestlepalooza 1997

1997

as Bill Alfonso (Manager)

ECW Born To Be Wired

1997

as Bill Alfonso

ECW As Good As It Gets

1997

as Bill Alfonso

ECW Hardcore Heaven 1997

1997

as Bill Alfonso (Manager)

ECW November to Remember 1997

1997

as Bill Alfonso (Manager)

4.5

ECW Heat Wave 1997

1997

as Bill Alfonso (Manager)

ECW Fan Cam: April 4, 1997

1997

as Bill Alfonso (Manager)

ECW Fan Cam: May 2, 1997 (Barely Legal II)

1997

as Bill Alfonso (Manager)

ECW Fan Cam: May 3, 1997

1997

as Bill Alfonso (Manager)

ECW Fan Cam: May 16, 1997

1997

as Bill Alfonso (Appearance)

ECW Fan Cam: November 23, 1996

1996

as Bill Alfonso (Manager)

ECW Fan Cam: October 18, 1996

1996

as Bill Alfonso (Manager)

ECW: January 27, 1996

1996

as Bill Alfonso (Appearance)

ECW Fan Cam: May 10, 1996

1996

as Bill Alfonso (Manager)

ECW Fan Cam: July 28, 1996

1996

as Bill Alfonso

ECW The Doctor Is In 1996

1996

as Bill Alfonso

ECW Massacre on Queens BLVD

1996

as Bill Alfonso (Manager)

ECW November to Remember 1996

1996

as Bill Alfonso

2.3

ECW House Party 1996

1996

as Bill Alfonso (Manager)

ECW CyberSlam 1996

1996

as Bill Alfonso

ECW Just Another Night 1996

1996

as Bill Alfonso

ECW Big Apple Blizzard Blast

1996

as Bill Alfonso

ECW Big Ass Extreme Bash 1996

1996

as Bill Alfonso

6.8

ECW Hostile City Showdown 1996

1996

as Bill Alfonso

ECW A Matter of Respect 1996

1996

as Bill Alfonso (Manager)

ECW Hardcore Heaven 1996

1996

as Bill Alfonso

3.5

ECW Natural Born Killaz

1996

as Bill Alfonso (Manager)

ECW When Worlds Collide 1996

1996

as Bill Alfonso

ECW Ultimate Jeopardy 1996

1996

as Bill Alfonso

ECW High Incident

1996

as Bill Alfonso (Manager)

ECW Holiday Hell 1996

1996

as Bill Alfonso

ECW Extreme Warfare Vol. 2

1996

as Bill Alfonso

ECW Barbed Wire, Hoodies and Chokeslams

1995

as Bill Alfonso (State Appointed Referee)