Samuel L. Barker

Dr. Barker has served as a director of the Company since September 2014. In 2001, Dr. Barker co-founded Clearview Projects, Inc., a provider of partnering and transaction services to biopharmaceutical companies, where he worked until September 2010, having served as its President and Chief Executive Officer from 2003 to 2004. Dr. Barker served in a series of leadership positions at Bristol-Myers Squibb Company until his retirement in 1999. His positions at Bristol-Myers Squibb included service as Executive Vice President, Worldwide Franchise Management and Strategy during 1998; President, United States Pharmaceuticals from 1992 to 1998; and President, Bristol-Myers Squibb Intercontinental Commercial Operations from 1989 to 1991. Prior to 1989, Dr. Barker held executive positions in research and development, manufacturing, business development and operations planning at Squibb Pharmaceuticals. Dr. Barker has served as a director of Lexicon Pharmaceuticals, Inc. since 2001 and as Chairman from 2005 to 2012. Dr. Barker also served as a director of Cadence Pharmaceuticals, Inc. from 2006 to 2014 and AtheroGenics, Inc. from 2005 to 2009. Dr. Barker received his B.S. from Henderson State College, his M.S. from the University of Arkansas and his Ph.D. from Purdue University.