NEW YORK (AP) — Niall Ferguson, a Harvard history professor and author, is apologizing for saying economist John Maynard Keynes didn’t care about the future because he was gay and had no children.

Ferguson made the remarks on Thursday during a question-and-answer session after a prepared speech at the Altegris Strategic Investment conference in Carlsbad, Calif. Asked to comment about Keynes, he suggested that the British economist’s philosophy was shaped by being homosexual and therefore childless.