John David Jackson (boxer) John David Jackson (boxer) John David Jackson (born May 17, 1963) is an American former professional boxer who competed from 1984 to 1999, and has since worked as a boxing trainer. He is a two-weight world champion, having held the WBO junior middleweight title twice between 1988 and 1993, and the WBA middleweight title from 1993 to 1994. Jackson turned professional in 1984 and won his first 20 fights. He won the inaugural WBO junior middleweight title in 1988 with a win over Lupe Aquino. He defended the title six times before moving up to middleweight in 1993 to take
World Boxing Organization champions Michael Moorer, Riddick Bowe, and Henry Akinwande relinquishing the title to pursue other options. Boxing publication "The Ring" also did not recognize the WBO, despite having recognized the IBF after its inception in 1983, five years prior to the WBO. In the lighter weight divisions, however, long-reigning champions during the 1990s such as Chris Eubank, Dariusz Michalczewski, Johnny Tapia, and Naseem Hamed gave the WBO title increasingly more prestige. The WBO was also made popular by boxers such as Marco Antonio Barrera, Oscar De La Hoya, Nigel Benn, Ronald "Winky" Wright, Joe Calzaghe, and Wladimir Klitschko, all of whom