Jay R. Luly, Ph.D., President, Chief Executive Officer and Director


Dr. Luly joined Enanta in July 2003. Prior to joining Enanta, Dr. Luly was an Entrepreneur in Residence at Oxford Bioscience Partners. Before joining Oxford in March 2002, Dr. Luly held the positions of Senior Vice President, Research and Development Operations and Senior Vice President, Discovery Strategy and Operations at Millennium Pharmaceuticals following Millennium’s merger with LeukoSite, Inc., where he had served as Senior Vice President, Drug Discovery and Preclinical Development. Prior to joining LeukoSite, he held a number of senior drug discovery positions at Abbott Laboratories from 1983 to 1997. Dr. Luly received a B.S. from the University of Illinois, Urbana/Champaign and a Ph.D. in synthetic organic chemistry from the University of California, Berkeley.

Yat Sun Or, Ph.D., Senior Vice President, Research & Development and Chief Scientific Officer


Dr. Or joined Enanta in November 1999. Prior to joining Enanta, Dr. Or held key leadership positions at Abbott Laboratories from 1985 to 1999, where he received two Chairman’s Awards for his outstanding research, which led to the discovery and development of numerous immunosuppressant and antibacterial drugs. Prior to Abbott, Dr. Or was a member of the cardiovascular drug discovery team at Schering-Plough. Dr. Or received his Ph.D. in Organic Chemistry from the University of Chicago and completed Postdoctoral Fellowships at Ohio State University and Indiana University.

Paul J. Mellett, Senior Vice President, Finance & Administration and Chief Financial Officer


Mr. Mellett joined Enanta in September 2003. Prior to joining Enanta, he held the position of Senior Vice President and Chief Financial Officer of Essential Therapeutics. Previously, Mr. Mellett was the Chief Financial Officer and Vice President of Administration at GelTex Pharmaceuticals, Inc., a publicly held biotechnology company that was acquired by Genzyme Corporation in December 2000. Mr. Mellett also served as Chief Financial Officer of Marshall Contractors, a construction management firm specializing in the pharmaceutical, biotechnology and semiconductor industries, which was acquired by Fluor Corporation. Earlier in his career, Mr. Mellett was employed with Deloitte & Touche LLP, a public accounting firm, where he served as Audit Partner. Mr. Mellett received a B.S. in Business Administration from Boston College.

Nathalie Adda, M.D., Senior Vice President and Chief Medical Officer


Dr. Adda joined Enanta in June 2015. Dr. Adda is a specialist in infectious disease and has more than 15 years of experience in the pharmaceutical industry in all phases of global clinical research and development and commercialization. Most recently, Dr. Adda was Chief Medical Officer, VP Clinical Development, Medical and Regulatory Affairs at Transgene SA, where she led the Oncology and Infectious Disease programs since 2012. From 2006 to 2012, she was Senior Medical Director and the medical lead for the Incivek® (telaprevir) Clinical Program at Vertex Pharmaceuticals Inc., where she designed the phase 2 and Phase 3 programs, and led the medical team in its successful marketing applications and registration in the USA, Canada, and, Asia. Earlier in her career, she held medical and research positions at Gilead, Triangle Pharmaceuticals and Boehringer Ingelheim, where she worked on programs for infectious diseases such as human immunodeficiency virus, hepatitis B virus and hepatitis C virus.

Dr. Adda is a graduate of the University of Paris, where she received a Doctorate in Medicine, as well as a Master’s Degree in Biostatistics, and where she did post-graduate work in infectious diseases.

Nathaniel S. Gardiner, J.D., Senior Vice President and General Counsel


Mr. Gardiner joined Enanta in 2014. Previously he was a corporate and securities law partner in private practice for 25 years, starting at Palmer & Dodge LLP and continuing through its merger into Edwards Angell Palmer & Dodge LLP, which then became Edwards Wildman Palmer LLP. Since 2008 Mr. Gardiner had been co-chair of the firm’s Life Sciences Group, and before that he was co-chair of the Business Law Department. In his private practice, Mr. Gardiner was Enanta’s outside counsel and Secretary since it was founded, and he led its IPO legal team. He also served for 15 years as a Trustee of Joslin Diabetes Center, Inc. in Boston, where he was a member of the Executive Committee and Chair of the Compensation Committee until 2015. Mr. Gardiner received his A.B. from Harvard College and his J.D. from the University of Virginia School of Law.