Executive Management

Jay R Luly, Ph. D., CEO of Enanta Pharmaceuticals

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.

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

Paul J. Mellett

Senior Vice President, Finance & Administration and Chief Financial Officer

Mr. Mellett joined Enanta in September 2003. From April 2001 through August 2003, 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. From 1994 to 1997, Mr. Mellett 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 in 1996. From 1977 to 1994, Mr. Mellett was employed with Deloitte & Touche LLP, a public accounting firm, and was promoted to Audit Partner in 1989. Mr. Mellett received a B.S. in Business Administration from Boston College in 1977.


Timothy D. Ocain, Ph.D.

Senior Vice President, New Product Strategy & Development

Dr. Ocain joined Enanta in 2014. Since 2010, Dr. Ocain has been an independent biotechnology consultant providing consulting services to a variety of companies.  From 2006-2009, he was a member of the executive team as the Senior Vice President, Research and Development at Seaside Therapeutics, a company focused on neurodevelopmental disorders.  Previously, he worked at Millennium Pharmaceuticals from 1998-2006 and held positions of increasing responsibility in drug discovery, program management and mostly recently held the position of Vice President, Inflammation Discovery. From 1993-1998 he worked at Procept, Inc, where he held senior level drug discovery positions, with additional responsibility for business development activities. Prior to Procept, he served in the medicinal chemistry department at Wyeth-Ayerst Research from 1986-1993. Dr. Ocain received his B.S. in Biological Sciences from the University of Wisconsin-Eau Claire and his Ph.D. in Pharmaceutical Chemistry from the University of Wisconsin-Madison, and completed his post-Doctoral Fellowship in Chemistry at the University of Minnesota.

Senior Vice President and General Counsel

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.