But behind his anger are personal grievances that predate the uproar that has engulfed campuses since the Oct. 7 attack by Hamas on Israel and Israel’s subsequent invasion of the Gaza Strip. Ackman, by his own admission and according to others around him, resents that officials at his alma mater, to which he’s donated tens of millions of dollars, and its president, Claudine Gay, have not heeded his advice on a variety of topics. In the two-month battle over the fate of Harvard’s president, billionaire investor William Ackman has cast himself as a protector of Jewish students and the standard-bearer...