- Michael L. Krenn
boxer, was born in Newark, New Jersey, the son of Ida Mae Hagler and Robert Sims. Most of his youth, however, was spent in Brockton, Massachusetts, where his mother and father moved with Marvin and his five siblings just a few years after Marvin's birth. Sims left the family when Marvin was a child. Like so many young men who turn to boxing, Hagler had found little to interest him in school. He dropped out during his first year in high school to pursue amateur fighting. The home of the former undefeated heavyweight king Rocky Marciano, Brockton had a history of producing champions. Hagler became acquainted with the Petronelli brothers, Goody, who served as his trainer, and Pat, who became his manager for most of his career.
Just shy of sixty amateur fights to his credit Hagler quickly established himself as one of the best amateur ...
A version of this article originally appeared in African American National Biography.