Vestar Capital Partners, a U.S. middle-market private equity firm, announced the promotions of Jake Olson, Diya Talwar, and Mike Vaupen to Managing Director. “Jake, Diya, and Mike have played integral roles in Vestar’s success, both on the investment side and within the firm,” said Dan O’Connell, Founder and CEO of Vestar. “Vestar had an active 2021, investing in five new…