Jamaal was a four-year letter winner and three-year starter at Rutgers. He was a second-team All-BIG EAST selection in 2006 and 2008. For his career, Jamaal finished with 26 sacks, third highest in school history, in 50 career games, and totaled 141 tackles, including 45 behind the line of scrimmage.
Jamaal was signed by the New York Jets as an undrafted free agent on April 27, 2009. On June 9, 2009, Jets head coach Rex Ryan said that he expected Westerman to make the team's final roster. He did and made the final roster as an outside linebacker and recorded two tackles and a sack in his debut against the Houston Texans on September 13. On October 9, 2011
Now in his third NFL season, Jamaal continues to excel as one of the Jets young and outstanding linebackers.
Jamaal was born in Brooklyn, New York on February 21, 1985. He and his family moved to Fort Lauderdale, Florida, where he began his high school career at St. Thomas Aquinas High School. Following his freshman season, he moved again, this time to Brampton, Ontario, and enrolled at Notre Dame Secondary School. Jamaal started every year he was there and led both the team and league in tackles and sacks. After graduating from Notre Dame in 2004 he was considered a two-star prospect by rivals.com. Rutgers, Boise State and Central Michigan all recruited him and all offered him scholarships. Jamaal eventually accepted Rutgers' scholarship offer.