When he was in middle school, Jaylin Green ran with a crowd that picked fistfights for the fun of it. But Saturday, the Roxbury teen was recognized for his contributions to a city program that combats teen dating violence in Boston.

Since 2008, Green has worked as a peer educator for the Start Strong program, which is run by the Boston Public Health Commission. The program teaches healthy relationship skills to Boston students ages 11 to 14, according to a statement from the city.