Jeffrey Yoskowitz is definitely a young Jewish leader to watch; it’s just sometimes hard to figure out exactly which Yoskowitz you’re watching. Recently returned home from Sweden, where he spoke at the Limmud Jewish education conference, Yoskowitz is a polymath in the Brooklyn mold. He’s a writer, researcher, pickler and social entrepreneur, a kosher foodie educated at Solomon Schechter schools in New Jersey who has never tasted pork — yet is writing a book about the pork industry in Israel. Yes, it’s non-fiction. Yoskowitz, 29, has been studying the industry since 2007, when he received a fellowship to do so after graduating from Brown University.