Mr. Clark retired from Merck in 2011. He joined Merck in 1972 and held a broad range of senior management positions. He became president and chief executive officer of Merck in May 2005 and chairman of the board in April 2007. He transitioned from the chief executive officer role in January 2011 and served as Merck board chairman through November 2011. He was president of the Merck Manufacturing Division (June 2003 to May 2005) of Merck Sharp & Dohme Corp. He serves on the advisory board of American Securities LLC, a private equity firm. He is chairman of the board of Project Hope and a trustee of several charitable non-profit organizations.As the former chairman, president and chief executive officer of a Fortune 100 company, Mr. Clark brings broad managerial expertise, operational expertise and deep business knowledge, as well as a track record of achievement.Mr. Clark currently serves on the Board of ADP, LLC.