About 12 years ago, Joel Chasnoff had a personal crisis. Fresh out of the University of Pennsylvania, he had no idea what he wanted to do with his life. His father’s success as a doctor in Chicago made him insecure, feeling like he had too big a pair of shoes to fill. And his passions — acting, stand-up comedy — hardly promised a stable alternative. But Chasnoff did have a strong Jewish identity, the result of a day school education, and an especially romantic vision of Israelis.