Raymond V. Gilmartin, age 61
    June 1994 - chairman of the Board (since November, 1994), president and chief executive officer

David W. Anstice, age 53
    March 2001 - president, The Americas and U.S. Human Health: responsible for one of the two prescription drug divisions comprising U.S. Human Health, as well as the Company’s prescription drug business in Canada and Latin America, and the Company’s joint venture relationship with Schering-Plough
    January 1997 - president, Human Health-The Americas - responsible for the Company’s human health business in the United States, Canada and Latin America

Paul R. Bell, age 56
    April 1997 - president, Human Health-Asia Pacific: responsible for the Company's prescription drug business in the Far East, Australia, New Zealand and Japan
    March 1994 - vice president, Merck Sharp & Dohme Australia and New Zealand

Richard T. Clark, age 56
    January 2000 - president, Merck-Medco Managed Care, L.L.C., a wholly-owned subsidiary of the Company
    June 1997 - executive vice president/chief operating officer, Merck-Medco Managed Care, L.L.C.
    April 1997 - senior vice president, Quality Commercial Affairs, Merck Manufacturing Division (MMD)
    May 1996 - senior vice president, North American Operations, MMD
    October 1994 - vice president, North American Operations, MMD

Kenneth C. Frazier, age 47
    December 1999 - senior vice president and general counsel: responsible for legal and public affairs functions and The Merck Company Foundation (a not-for-profit charitable organization affiliated with the Company)
    January 1999 - vice president and deputy general counsel
    January 1997 - vice president, Public Affairs and assistant general counsel: responsible for public affairs, corporate legal activities and The Merck Company Foundation
    April 1994 - vice president, Public Affairs

Bernard J. Kelley, age 60
    December 1993 - president, Merck Manufacturing Division

Judy C. Lewent, age 53
    February 2001 - executive vice president and chief financial officer: responsible for financial and corporate development functions, internal auditing, corporate licensing, the Company's joint venture relationships, and Merck Capital Ventures, LLC, a wholly-owned subsidiary of the Company
    November 2000 - senior vice president and chief financial officer: responsible for financial and corporate development functions, internal auditing, corporate licensing, the Company's joint venture relationships, and Merck Capital Ventures, LLC, a wholly-owned subsidiary of the Company
    January 1997 - senior vice president and chief financial officer: responsible for financial and corporate development functions, internal auditing and the Company's joint venture relationships
    September 1994 - senior vice president and chief financial officer (since January, 1993): responsible for financial and public affairs functions, The Merck Company Foundation (a not-for-profit charitable organization affiliated with the Company) (since December, 1993), internal auditing and the Company's joint venture relationships

Adel Mahmoud, M.D., Ph.D., age 60
    May 1999 - president, Merck Vaccines
    November 1998 - executive vice president, Merck Vaccines
    Prior to November 1998, Dr. Mahmoud was the John H. Hord professor and chairman, Department of Medicine and physician-in-chief, Case Western Reserve University and University Hospitals of Cleveland (1987-1998)

Edward M. Scolnick, M.D., age 61
    December 1999 - executive vice president, Science and Technology and president, Merck Research Laboratories (MRL): responsible for worldwide research function, computer resources and corporate licensing
    September 1994 - executive vice president (since January, 1993), Science and Technology and president, MRL (since May, 1985): responsible for worldwide research function and activities of Merck Manufacturing Division (since December, 1993), computer resources (since January, 1993) and corporate licensing

Bradley T. Sheares, Ph.D., age 45
    March 2001 - president, U.S. Human Health: responsible for one of the two prescription drug divisions comprising U.S. Human Health (USHH)
    July 1998 - vice president, Hospital Marketing and Sales, USHH
    May 1996 - vice president, Anti-Infectives Therapeutic Business Group, USHH

Per Wold-Olsen, age 54
    January 1997 - president, Human Health-Europe, Middle East & Africa: responsible for the Company's prescription drug business in Europe, the Middle East and Africa and worldwide human health marketing
    September 1994 - president, Human Health-Europe: responsible for the Company's European prescription drug business

Wendy L. Yarno, age 47
    December 1999 - senior vice president, Human Resources
    June 1999 - vice president, Human Resources
    January 1999 - vice president, Worldwide Human Health Marketing
    November 1997 to January 1999, Ms. Yarno was vice president, Women's Health Care, Johnson & Johnson, Ortho-McNeil Pharmaceutical (manufacturer of pharmaceuticals)
    January 1995 to November 1997 - vice president, Hypertension and Heart Failure Therapeutic Business Group, U.S. Human Health