He was a star player on the Magruder High School basketball team. Drafted out of Georgetown University by the Detroit Pistons with the 26th pick of the 1996 NBA draft (the pick originally belonged to the San Antonio Spurs and went to the Pistons in the Dennis Rodman trade), he played four-plus years with the Pistons, becoming one of their key reserves. He was a fan favorite during his days playing for the Toronto Raptors due to his tenacious efforts on the court.
On February 22, 2001, Williams was traded from the Detroit Pistons, along with Eric Montross, to the Toronto Raptors in exchange for Corliss Williamson, Tyrone Corbin, Dávid Kornél and a future first-round draft pick. He was so enthusiastic about joining his new teammates that he immediately drove from Detroit to Toronto upon hearing the news. In 2002–03 with the Raptors, Williams averaged 9.7 points per game, primarily as a starter, his career-best scoring average. In 2003, Williams also made a cameo appearance in the Disney Channel movie Full-Court Miracle.
On August 15, 2005, the Knicks waived Williams to avoid luxury taxes on his salary, as part of the NBA's new labor agreement. He announced his retirement from his playing career less than 48 hours later. Williams played in 587 games over nine seasons, averaging 6.6 points and 6.4 rebounds per game.
Williams joined the NBA's "Basketball Without Borders" program, an effort to teach the game and bring resources to underdeveloped nations in Africa, Asia and elsewhere. In Toronto, he was always greeted with a standing ovation when he returned in a Bulls or Knicks uniform. Nicknamed the Junk Yard Dog (or JYD) by Rick Mahorn in his early days as a Detroit Piston for his hard work and hustle (as stated in an interview while he served as a commentator on NBA TV), Williams sometimes referred to himself in the third person.
On January 25, 2006, Williams rejoined the Toronto Raptors as their community representative.[1]
Williams also played a minor role in the Canadian FBI show, Sue Thomas: F.B. Eye. He played Otis Washington, a dealer turned informant.
Williams was hired as Director of Player Development for the national champion Findlay Prep basketball team before becoming assistant coach.[2] In the summer of 2013, Jerome was promoted to the position of Head Coach at Findlay Prep. He stepped down as head coach in the summer of 2014.[3]
Williams continues to be a part of youth development through basketball as he was appointed the President of The Young3 which holds 3-on-3 tournaments for young people ages 9–14.[4]
Williams and other basketball legends have implemented a digital educational program throughout North America, called Shooting For Peace.[5][6]