A Yeshiva University professor left two years ago as a man - and returned last week as a woman. Literature Professor Joy Ladin, formerly known as Jay Ladin, 47, showed up for her first day of school sporting pink lipstick, a tight purple shirt and a flirty black skirt. She cheerfully strutted through the doors of the Midtown campus' main building, where she oversees the writing center. Many at the Jewish university are horrified by the presence of the transgender professor. Some fear the news could cut alumni donations. Ladin and the school won't comment on the situation, but some...