Dean J. Mitchell has been a director of ImmunoGen since 2012. Mr. Mitchell has served as Executive Chairman of the Board of Covis Pharma Holdings S.a.r.l. since 2013. Prior to that he served as President and Chief Executive Officer of Lux Biosciences, Inc. from 2010 to August 2013. Prior to that he served as President and Chief Executive Officer of Alpharma, Inc. from 2006 until its acquisition by King Pharmaceuticals, Inc. in 2008. Prior to that he served as President and Chief Executive Officer of Guilford Pharmaceuticals, Inc. from 2004 until its acquisition by MGI PHARMA, INC. in 2005. Prior to that he served in various senior executive capacities in the worldwide medicines group of Bristol-Myers Squibb Company from 2001 to 2004. Prior to that he spent 14 years at GlaxoSmithKline plc in assignments of increasing responsibility spanning sales, marketing, general management, commercial strategy and clinical development and product strategy. Mr. Mitchell is also a director of Inrexon, Inc. and Theravance BioPharma, Inc.