Julia Owens, Ph.D.


Dr. Owens has served as a member of our board of directors since April 2021. Dr. Owens currently serves as the executive chairperson for Millendo Therapeutics, Inc., a company that she co-founded in 2012. For nine years, she served as the president and chief executive Officer of Millendo, establishing its strategy, building its endocrine disease pipeline and attracting a world class team. Under her leadership, the company raised $195 million from both the private and public markets, and advanced four distinct product candidates into clinical studies in six different indications, including four Phase 2 programs and a pivotal study. Prior to co-founding Millendo, she served as senior vice president, corporate development and strategy at Lycera Corp. Dr. Owens also held business development roles at QuatRx Pharmaceuticals, which was acquired by Shionogi following the approval of Osphena®, and at Tularik Inc. (acquired by Amgen). She is on the board of the Biotechnology Innovation Organization (BIO), the Leadership Council of the University of Michigan Life Sciences Institute, and the Investment Advisory Board of the Michigan Biomedical Venture Fund. Dr. Owens holds a Ph.D. in biochemistry from the University of California, San Francisco and a B.S. in chemistry and B.A. in molecular and cellular biology from the University of California, Berkeley.

Amir Nashat, Ph.D.


Dr. Nashat has served as a member of our board of directors since January 2015. He is a managing partner at Polaris Partners, a venture capital firm, where he has worked since April 2002. Dr. Nashat was also the founding Chief Executive Officer of Living Proof, Inc. and Sun Catalytix Corporation. He currently represents Polaris on the boards of Scholar Rock, Agbiome, Inc., aTyr Pharmaceuticals, Inc., Fate Therapeutics, Inc., Jnana Therapeutics, where he also serves as the Chief Executive Officer, CAMP4, Morphic Therapeutic, Inc., Olivo Labs, Promedior, Inc., Selecta Biosciences Inc., Syros Pharmaceuticals, Inc., and Taris Biomedical, LLC. Dr. Nashat also serves on the Partners Innovation Fund, the Investment Advisory Committee for The Engine at MIT, and helped launch the MIT Sandbox Innovation Fund as its active president. He previously served on the board of directors of the New England Venture Capital Association. He received an M.S. and B.S. in materials science and mechanical engineering from the University of California, Berkeley and a Sc.D. as a Hertz Fellow in chemical engineering at MIT with a minor in biology.

John McHutchison, AO, M.D.


Dr. McHutchison joined our board in June 2020. Since August 2019, Dr. McHutchison has served as the President and Chief Executive Officer and as a director of Assembly Biosciences, Inc. a clinical-stage biotechnology company. Prior to joining Assembly Biosciences, Inc., he was the Chief Scientific Officer and Head of Research and Development of Gilead Sciences, Inc. Prior to joining Gilead in 2010, Dr. McHutchison worked at Duke University Medical Center, where he served as Associate Director of the Duke Clinical Research Institute. He also held the positions of Professor of Medicine in the Division of Gastroenterology at Duke University Medical Center, Associate Director at Duke Clinical Research Institute and Co-Director of the Duke Clinical and Translational Science Award. Prior to his positions at Duke University, Dr. McHutchison spent nearly 10 years at Scripps Clinic, most recently as Medical Director, Liver Transplantation. He also previously held an Assistant Professorship in Medicine at the University of Southern California. In June 2018, Dr. McHutchison was appointed an Officer of the Order of Australia in recognition of his distinguished service to medical research in gastroenterology and hepatology. Dr. McHutchison has undergraduate degrees in medicine and surgery from the University of Melbourne in Australia and completed his residency in internal medicine and fellowship in gastroenterology at the Royal Melbourne Hospital. He is a member of the Royal Australasian College of Physicians.

Preston Klassen, M.D., MHS

President and Chief Executive Officer

Dr. Klassen has served as our President and Chief Executive Officer and as a member of our board of directors since June 2020. From March 2017 to June 2020, Dr. Klassen served as Executive Vice President, Head of Research and Development and Chief Medical Officer of Arena Pharmaceuticals, Inc. From June 2016 to March 2017, he was Chief Medical Officer of Laboratoris Sanifit S.L., a biotechnology company, and prior to that, from November 2009 to May 2016, was Executive Vice President, Head of Global Development at Orexigen Therapeutics, Inc. Dr. Klassen also held several positions of increasing responsibility at Amgen Inc., including Therapeutic Area Head for Nephrology. Before joining Amgen, he was a faculty member in the Division of Nephrology at Duke University Medical Center. Dr. Klassen holds a B.S. in Chemistry from Central University of Iowa. Dr. Klassen received his medical degree from the University of Nebraska College of Medicine and completed his residency in internal medicine, fellowship in nephrology, and Master of Health Sciences degree at Duke University.

Jeff Jonker


Mr. Jonker has served as a member of our board of directors since March 2021. Mr. Jonker currently serves as a senior advisor for Ambys Medicines, where he was previously the President and Chief Executive Officer and a Director. During his tenure at Ambys Medicines, Mr. Jonker leveraged the company’s $140 million Series A financing and strategic partnership with Takeda to establish a pioneering cell therapy platform, including the build out of a cGMP cell therapy manufacturing facility to enable clinical and commercial supply of human hepatocytes. Prior to Ambys Medicines, Mr. Jonker served as president of NGM Biopharmaceuticals, where he led the advancement of the company’s robust pipeline, including therapeutics for immune-oncology, retinal, liver and metabolic diseases. Mr. Jonker holds a J.D. from Columbia University School of Law, an M.LITT. from the University of St. Andrews and a B.A. from Claremont McKenna College.

Andrew Guggenhime


Mr. Guggenhime has served as a member of our board of directors since July 2018. He currently serves as Chief Financial Officer and Chief Business Officer of Vaxcyte, Inc., a public vaccine company. From April 2014 to May 2020, Mr. Guggenhime served as Chief Financial Officer of Dermira, and from April 2014 to May 2018 he also served as Chief Operating Officer. From September 2011 to April 2014, Mr. Guggenhime served as Chief Financial Officer of CardioDx, Inc., a molecular diagnostics life sciences company, and as a member of the CardioDx board of directors from April 2014 until July 2016. From September 2010 to April 2011, he served as Chief Financial Officer of Calistoga Pharmaceuticals, Inc., a biotechnology company acquired in April 2011 by Gilead Sciences, Inc. From December 2008 to June 2010, Mr. Guggenhime served as Senior Vice President and Chief Financial Officer of Facet Biotech Corporation, a biotechnology company acquired in April 2010 by Abbott Laboratories. Facet Biotech Corporation was spun off from PDL BioPharma, Inc. at which Mr. Guggenhime served as Senior Vice President and Chief Financial Officer from April 2006 to December 2008. From October 2000 to March 2006, he served as Chief Financial Officer of Neoforma, Inc., a provider of supply-chain management solutions for the healthcare industry acquired by Global Healthcare Exchange, LLC in March 2006. From January to October 2000, Mr. Guggenhime served as Neoforma’s Vice President, Corporate Development. Mr. Guggenhime began his career in financial services at Merrill Lynch & Co. and Wells Fargo & Company. He holds a B.A. in International Politics and Economics from Middlebury College and holds an M.B.A. from the J.L. Kellogg Graduate School of Management at Northwestern University.

Ronald Evans, Ph.D.


Dr. Evans, one of our co-founders, has served as a member of our board of directors since September 2014. He is a professor, director and biologist at The Salk Institute, where he serves as the March of Dimes Chair in Molecular and Developmental Neurobiology. Dr. Evans became a faculty member of The Salk Institute in 1978. He also serves as a Howard Hughes Medical Institute Investigator, a position he has held since 1985. Dr. Evans was elected to the National Academy of Sciences in 1989. He received his B.S. and Ph.D. degrees from UCLA in 1970 and 1974, respectively, followed by a postdoctoral training at Rockefeller University from 1975-1978.

Richard Heyman, Ph.D.


Dr. Heyman, one of our co-founders, joined our board in September 2014 and has served as our Chairman since June 2015. From August 2013 to April 2015, he served as the Chief Executive Officer of Seragon, which he also co-founded. Prior to joining Seragon, he served as the Chief Executive Officer of Aragon, which he co-founded in 2009. Dr. Heyman has served as Chairman of the Board of Directors of ORIC Pharmaceuticals, Inc., a private company focused on the discovery and development of novel therapies for treatment-resistant cancers, since November 2014. He serves as Vice Chair of the Board of Trustees of The Salk, and is a board member of Gritstone Oncology, Inc., Yumanity Therapeutics Inc., Vividion Therapeutics, Inc., and Mavupharma Inc. Dr. Heyman also serves on the Executive Committee of the Board of Visitors at the UCSD Moores Cancer Center. He received a Ph.D. in pharmacology from the University of Minnesota and a B.S. in chemistry from the University of Connecticut.