Columbia University’s president, Nemat Shafik, resigned on Wednesday after months of far-reaching fury over her handling of pro-Palestinian demonstrations and questions over her management of a bitterly divided campus. She was the third leader of an Ivy League university to resign in about eight months following maligned appearances before Congress about antisemitism on their campuses. Dr. Shafik, an economist who spent much of her career in London, said in a letter to the Columbia...