Brian S. Posner

Brian S. Posner has served as a director of Arch Capital since November 2010. Mr. Posner has been a private investor since March 2008 and is the President of Point Rider Group LLC, a consulting and advisory services firm focused on financial, bio-pharmaceutical and other services-related companies. From 2005 to March 2008, Mr. Posner served as the President, Chief Executive Officer and Co-Chief Investment Officer of ClearBridge Advisors, LLC, an asset management company and a wholly owned subsidiary of Legg Mason. Prior to that, Mr. Posner co-founded Hygrove Partners LLC, a private investment fund, in 2000 and served as the Managing Member for five years. He served as a portfolio manager and an analyst at Fidelity Investments from 1987 to 1996 and, from 1997 to 1999, at Warburg Pincus Asset Management/Credit Suisse Asset Management where he also served as Co-Chief Investment Officer and director of research. Mr. Posner currently serves on the board of directors of Biogen Inc. and he is a trustee of the AQR Funds. He holds a B.A. from Northwestern University and an M.B.A. from the University of Chicago Booth School of Business.