Nicknamed The Hawk, he was one of the best pound-for-pound punchers ever, and a 3-time Light-Middleweight and Middlweight champion.
Most of his early amateur fights took place in Puerto Rico, where he lived for a time.
He was ranked #25 on Ring Magazine's list of the 100 Greatest Punchers Of All-Time.
He is distantly related to boxer, Peter Jackson.
He won the WBC Middleweight title by beating England's Herol Graham on November 24, 1990.