Dr. Pomerantz has served as Chairman of our board of directors and our Chief Executive Officer since April 2019. Prior to that, he had served as Vice Chairman of our board of directors since May 2014. From November 2013 to December 2019, Dr. Pomerantz served as Chairman of the board of directors of Seres Therapeutics, Inc., a biotechnology company, and as its President and Chief Executive Officer from June 2014 to January 2019. From 2011 to 2013, he was formerly Worldwide Head of Licensing & Acquisitions, Senior Vice President at Merck & Co., Inc. where he oversaw all licensing and acquisitions at Merck Research Laboratories. Previously, he served as Senior Vice President and Global Franchise Head of Infectious Diseases at Merck. Prior to joining Merck, Dr. Pomerantz was Global Head of Infectious Diseases for Johnson & Johnson Pharmaceuticals. He joined Johnson & Johnson in 2005 as President of Tibotec Pharmaceuticals, Inc. Dr. Pomerantz serves as Chairman of the board of directors of the public company Collplant Biotechnologies, Inc., a board member of the public company Intec Therapeutics, Inc., Chairman of the board of directors of the private company Silicon Therapeutics Inc. and a member of the board of the private company X-VAX Technology, Inc.

Dr. Pomerantz received his B.A. in Biochemistry at the Johns Hopkins University and his M.D. at the Johns Hopkins School of Medicine. He received post-graduate training at the Massachusetts General Hospital, Harvard Medical School and M.I.T. Dr. Pomerantz is Board Certified in both Internal Medicine and Infectious Diseases. He was Professor of Medicine, Biochemistry and Molecular Pharmacology, Chief of Infectious Diseases, and the Founding Director and Chair of the Institute for Human Virology and Biodefense at the Thomas Jefferson University and Medical School. He has developed nine drugs approved world-wide in important diseases, including HIV, HCV, CMV, Clostridium difficile, and tuberculosis.