Wendell Wierenga, Ph.D. has served as a member of our Board of Directors since February 2011. From June 2011 to January 2014, Dr. Wierenga served as Executive Vice President, Research and Development, at Santarus, Inc., acquired by Salix Inc., which was subsequently acquired by Valeant Pharmaceuticals International, Inc. From 2006 to 2011, he served as Executive Vice President, Research and Development, at Ambit Biosciences Corporation. From 2003 to 2006, he served as Executive Vice President of Research and Development at Neurocrine Biosciences, Inc. From 2000 to 2003, Dr. Wierenga served as Chief Executive Officer of Syrrx, Inc. (now part of Takeda Pharmaceutical Company). From 1990 to 2000, he was Senior Vice President of Worldwide Pharmaceutical Sciences, Technologies and Development at Parke-Davis/Warner Lambert (now Pfizer, Inc.). Prior to that, Dr. Wierenga spent 16 years at Upjohn Pharmaceuticals in research and drug discovery roles, most recently as Executive Director of Discovery Research. Dr. Wierenga has served on the Board of Directors of Crinetics Pharmaceuticals since 2014 and Dermata Therapeutics since September 2016. He also served on the Board of Directors of Onyx Pharmaceuticals, Inc. from 1996 to 2013, XenoPort, Inc. from 2001 to August 2016, Ocera Therapeutics, Inc. from December 2013 to December 2018, Anacor Pharmaceuticals, Inc. from September 2014 to July 2016, Apricus Biosciences, Inc. from March 2014 to December 2018, Concert Pharmaceuticals, Inc. from March 2014 to June 2019 and Patara Pharma, Inc. from 2015 to November 2018. Dr. Wierenga holds a B.A. from Hope College and a Ph.D. in Chemistry from Stanford University. Dr. Wierenga brings to our Board of Directors over thirty years of experience in matters relating to pharmaceutical drug discovery and development in a wide range of therapeutic areas, and an extensive background as a public company executive and board member in the pharmaceutical and biotechnology industries.