William Rastetter, Ph.D.

Dr. Rastetter has served as Chairman of the Board and a director since November 2011. From February 2012 to October 2012, he also served as our interim Chief Executive Officer. He is a Co-Founder of Receptos, Inc., a biopharmaceutical company acquired by Celgene Corporation in 2015, and he served as a director and Chairman of the board of Receptos, Inc. from 2009 to 2015, and was Acting Chief Executive Officer from May 2009 to November 2010. Dr. Rastetter also served as the Chairman of Illumina, Inc. from 2005 to 2016, and as a director of Illumina, Inc. from 1998 to 2016. Dr. Rastetter currently serves as the Chairman of Neurocrine Biosciences, Inc., as a director of Grail, Inc. and Regulus Therapeutics, Inc., and as Chairman of Daré Bioscience, Inc., previously known as Cerulean Pharma, Inc. He also serves as a strategic advisor to SVB Leerink, a healthcare focused investment bank, and as an advisor to Illumina Ventures, a genomics focused venture firm. Dr. Rastetter served as a Partner at the venture capital firm of Venrock from 2006 to February 2013. Prior to that, Dr. Rastetter was Executive Chairman of Biogen Idec, from the merger of the two companies (Biogen and Idec Pharmaceuticals) in 2003 through the end of 2005. He joined Idec Pharmaceuticals at its founding in 1986 and served as Chairman and Chief Executive Officer. Prior to Idec, he was Director of Corporate Ventures at Genentech, Inc. and also served in a scientific capacity at Genentech. Dr. Rastetter held various faculty positions at the Massachusetts Institute of Technology and Harvard University and was an Alfred P. Sloan Fellow. Dr. Rastetter holds a Ph.D. and M.A. in chemistry from Harvard University and an S.B. in chemistry from the Massachusetts Institute of Technology.