When Chapel Hill-native Joshua Lozoff was 19, he moved to Los Angeles to be an actor, and the move paid off. He played a recurring role on the sitcom “Cheers.” He was part of the ensemble cast in the hit movie “Clueless,” and he was also on the cult favorite nighttime sitcom “Sisters.” But after the Northridge earthquake in 1994, Lozoff decided to devote himself to public service.