Richard T. Clark is retired chairman and CEO of Merck. He served as chairman from April 2007 until December 2011. Mr. Clark was CEO of Merck from May 2005 through December 2010. He also was president of Merck from 2005 until May 2010.
*Bio courtesty of Penn State University
Richard Clark is currently serving as an Independent Director at ADP Inc., and as the Lead Director at Corning Inc.