Antonio Margarito Montiel (born on March 18, 1978 in Torrance, California) is a Mexican-American professional boxer. He is a former World Boxing Association, International Boxing Federation, and World Boxing Organization Welterweight champion. Nicknamed El Tornado de Tijuana, he is known for his aggressive fighting style and his iron chin. Margarito's reputation was tarnished by an incident in which his corner is alleged to have tampered with his hand wraps prior to his bout with Shane Mosley, which were found by the CSAC to contain sulfur and calcium which, when combined with oxygen, forms "Plaster of Paris". He is currently trained by former IBF Super Featherweight Champion Roberto García. Antonio also manages IBFLightweight Champion Miguel Vazquez.