Turned pro in 1993 after a successful amateur career
After winning the title and going undefeated as a lightweight, moved up two weight classes in 2000 to beat Oscar De La Hoya and win the welterweight title
In 2003, won the light-middleweight title by defeating De La Hoya a second time
Admitted to using illegal drugs EPO, THG and testosterone for the 2003 De La Hoya fight, but said he believed they were vitamins
Upset Antonio Margarito in January 2009 to re-take welterweight title
Agreed to arbitrary drug testing with blood and urine tests for May 2010 fight with Floyd Mayweather
Is a business partner with De La Hoya in Golden Boy Promotions
Has worked with PETA in campaigns to save the seals and stop dogfighting