After a two year absence, 47-year-old Yeshiva University literature professor Jay Ladin returned to school last week as Joy Ladin, putting the oy in Joy by arriving at the midtown campus wearing a black skirt and pink lipstick. According to the head of the National Center for Transgender Equality, Ladin is the only transgender employee of a religiously conservative university in America. Unsurprisingly, some feathers have been ruffled. Rabbi Moshe Tendler, a senior dean at......