Rosner is co-president of Vestar and a founding partner of the firm. Previously, he was based in Paris and served as president of Vestar Europe. He also heads the firm’s diversified industries and financial services sectors.

He is a director of Institutional Shareholder Services, Triton Container International Limited, 21st Century Oncology, and Tervita Corporation.

Prior to Vestar, Rosner was a member of the management buyout group of The First Boston Corporation, where he worked with other members of the firm’s founding team before leaving to launch Vestar Capital Partners. He holds an MBA from The Wharton School of the University of Pennsylvania and a B.A. in economics from Trinity College.