Paul Shain

Senior Vice President

President and Chief Executive Officer

CDW Corporation

Berbee Information Networks Corporation

Paul S. Shain has been Senior Vice President of CDW Corp., since January 2007. Mr. Shain joined CDW in October 2006. Mr. Shain is responsible for leading the Berbee business unit and jointly overseeing all aspects of the transition of Berbee into CDW. Mr. Shain serves on Executive Partner Councils for both IBM Corporation and Cisco Systems. Mr. Shain served as chief executive officer of Madison, Wisconsin-based Berbee Information Networks Corporation, which CDW acquired in October, 2006. Mr. Shain joined Berbee in 2000 as president and was appointed chief executive officer in 2005. Mr. Shain served as managing director and director of research for Robert W. Baird & Co., Inc. At Baird, he served as the senior IT services analyst and was responsible for the overall supervision and administration of Baird's equity research efforts. In addition to serving on several charitable boards, he is involved with the School of Business at the University of Wisconsin-Madison, including serving on the Advisory Board of the Nicholas Center for Corporate Finance and Investment Banking.