William Matthew "Bill" Sierra (born August 11, 1957) 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. Career Early career, World Championship Wrestling and World Wrestling Federation (1979–1995) Alfonso refereed his first match in Texas at the age of 21. He was the official in a chain match between The Sheik and Terry Funk. Shortly thereafter, he took on a regular role as a referee in Championship Wrestling from Florida. He is seen on footage from 1983 as an "NWA official" sitting in the conference room as the main event of the first Starrcade between Harley Race and Ric Flair is being announced by Bob Geigel. He then worked in every major American promotion, including World Championship Wrestling and the World Wrestling Federation, where he was a referee for The Undertaker and Giant Gonzalez (who Alfonso was an agent for) match at WrestleMania IX. Extreme Championship Wrestling (1995–2001) Alfonso made his debut in Extreme Championship Wrestling In May 1995 at Enter the Sandman 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. In this role, he engaged in a feud with ECW founder Tod Gordon that resulted in several wrestling matches. Alfonso was then stripped of his refereeing duties and took on the role of Taz's manager and helped him on a winning streak that lasted over a year. In the midst of Taz's feud with Sabu, however, Alfonso turned on his charge and aligned with Sabu. In this role, he performed more than the usual duties, as he actually managed Sabu's finances. Rob Van Dam later took on Alfonso as a manager and formed a tag team with Sabu. Alfonso also led Van Dam to the longest ECW World Television Championship reign in the history of ECW. In September 1997 at As Good as It Gets, Alfonso fought Beulah McGillicutty with this match becoming infamous because Alfonso lost 1/3 of the blood in his body according to Paul Heyman. Return to WWE (2005–2006) Alfonso returned to the WWE (the former WWF)