Billionaire Len Blavatnik is throwing his weight behind Apollo CEO Marc Rowan’s efforts to pressure the University of Pennsylvania over antisemitism on campus amid the Israel-Hamas war, On The Money has learned. Unlike Rowan — who has donated more than $50 million to UPenn and has called on fellow alumni to “close their checkbooks” — Blavatnik didn’t attend the embattled Ivy League school. In 2018, however, Blavatnik gave $2 million to endow a scholarship at UPenn’s Perelman School of Medicine. In a Monday letter to UPenn president Liz Magill and medical school dean Larry Jameson, Blavatnik thanked the pair for...