The president, Nemat Shafik, disclosed the disciplinary details, which are usually confidential, as part of an all-out effort Wednesday to persuade a House committee investigating Columbia that she was taking serious action to combat a wave of antisemitism following the Israel-Hamas war. And when she was grilled over whether she would remove another professor from his leadership position, she appeared to make a decision right there on Capitol Hill: “I think I would, yes.” The president of Columbia said the university had suspended 15 students. She promised that one visiting professor “will never work at Columbia again.” In nearly four...