Kenneth C. Frazier

Chairman of the board, president and chief executive officer,
Merck & Co., Inc. Director, PhRMA, Exxon Mobil, The Pennsylvania State University and Cornerstone Christian Academy. Our director since Jan. 1, 2011.

Leslie A. Brun

Chairman and chief executive officer, Sarr Group, LLC (investment holding company). Non-executive chairman, Automatic Data Processing, Inc. and Broadridge Financial Solutions, Inc., Director, NXT Capital, Inc. Our director since July 22, 2008.

Thomas R. Cech, Ph.D.

Investigator, Howard Hughes Medical Institute.
Faculty, University of Colorado. Our director since May 27, 2009.

Thomas H. Glocer

Retired chief executive officer, Thomson Reuters Corporation (information and services company for businesses and professionals). Director, The Partnership for New York City and Council on Foreign Relations. Our director since Nov. 27, 2007.

Steven F. Goldstone

Retired chairman and chief executive officer, RJR Nabisco, Inc. Managing partner, Silver Spring Group (private investment firm). Non-executive chairman, ConAgra Foods, Inc. Director, Greenhill & Co., Inc. Our director since Sept. 25, 2007.

William B. Harrison, Jr.

Lead director of the Board. Retired chairman of the board, JPMorgan Chase & Co. (financial services). Chairman, Cadence Bancorp LLC, formerly Community Bancorp LLC (bank holding company). Director, Aurora Capital Group, Cousins Properties Incorporated, Lincoln Center for Performing Arts, RecoverCare LLC and The University of North Carolina Endowment Fund. Our director since Dec. 21, 1999.

Harry R. Jacobson, M.D.

Vice chancellor, Health Affairs, Emeritus (since June 2009), Vanderbilt University. Non-executive chairman, CeloNova BioSciences, Inc. Director, BioNumerik Pharmaceuticals Inc., Ingram Industries, Inc., MedSolutions and Specialty Care. Our director since Dec. 18, 2007.

William N. Kelley, M.D.

Professor of Medicine, Biochemistry and Biophysics, University of Pennsylvania School of Medicine. Director, Beckman Coulter, Inc. and GenVec, Inc. Our director since Sept. 1, 1992.

C. Robert Kidder

Former chairman and chief executive officer, 3Stone Advisors LLC (private investment firm). Director, Morgan Stanley and Microvi Biotech Inc. Our director since Dec. 5, 2005.

Rochelle B. Lazarus

Chairman, Ogilvy & Mather Worldwide (advertising and marketing communication company). Director, General Electric, The Partnership for New York City and the World Wildlife Fund. Our director since Oct. 26, 2004.

Carlos E. Represas

Retired chairman, Nestlé Group Mexico. Director, Bombardier Inc., Swiss Re Group and Swiss Re American Holding Corporation. Our director since Feb. 24, 2009.

Patricia F. Russo

Former chief executive officer and director, Alcatel-Lucent.
Lead director, General Motors Company; director, Alcoa, Inc. and Hewlett-Packard Company. Our director since Sept. 1, 1995.

Anne M. Tatlock

Retired chairman of the board and chief executive officer, Fiduciary Trust Company International (global asset management services). Director, Beam Inc. (formerly Fortune Brands, Inc.) and Franklin Resources, Inc. Our director since Feb. 22, 2000.

Craig B. Thompson, M.D.

President and chief executive officer, Memorial Sloan-Kettering Cancer Center. Director, American Association for Cancer Research. Our director since Jan. 2, 2008.

Wendell P. Weeks

President, chairman and chief executive officer, Corning Incorporated (technology company in telecommunications, information display and advanced materials industries). Director, Corning Incorporated. Our director since Feb. 24, 2004.

Peter C. Wendell

Managing director, Sierra Ventures (technology-oriented venture capital firm). Faculty, Stanford University Graduate School of Business. Senior advisor and director, WestBridge Crossover Fund, LLC. Our director since Sept. 23, 2003.

Dates prior to the merger of Merck & Co., Inc. ("Merck") and Schering-Plough Corporation("Schering-Plough") on November 3, 2009, reflect membership on the board of legacy Merck (Brun, Cech, Glocer, Goldstone, Harrison, Jacobson, Kelley, Lazarus, Represas, Shenk, Tatlock, Weeks and Wendell) or legacy Schering-Plough (Kidder, Russo and Thompson), as the case may be.