The following members make up the Viracta Board of Directors.  Please select an individual member below to learn more about them and the committees they contribute to.

  • Roger J. Pomerantz, M.D.

    Chairman of the Board

    Dr. Pomerantz has served as a member of the board of directors of Viracta since June 2020 and was appointed Chair in September 2020. Dr. Pomerantz has been President, Chief Executive Officer and Chairman of the Board of ContraFect Corporation (NASDAQ: CFRX) since April 2019. Previously, Dr. Pomerantz was a Venture Partner at Flagship Pioneering from 2014 through 2019. In addition, he served as the President, Chief Executive Officer and Chairman of the Board of Seres Therapeutics from 2014-2019, where he continues to serve as Senior Advisor to its Board of Directors. Previously, Dr. Pomerantz was Senior Vice President, Worldwide Head of Licensing & Acquisition at Merck & Co., Inc and prior to that was 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 also served as Chief Executive Officer of Tibotec Pharmaceuticals, Inc. Dr. Pomerantz currently serves on the boards of Intec Pharma Ltd. (NASDAQ: NTEC). 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.

  • Thomas E. Darcy


    Mr. Darcy brings financial expertise and extensive experience in the management of public life science companies to Viracta’s Board. Mr. Darcy was previously a co-founder and director of Tocagen Inc. from 2007-2020 and Executive Vice President (EVP) and Chief Financial Officer (CFO) of Tocagen from 2007-2017. Prior to Tocagen, Mr. Darcy served as EVP and CFO of Science Applications International Corporation, a Fortune 500 science and technology company, as well as in leadership roles as an audit partner of PricewaterhouseCoopers, LLP. 

  • Michael Huang, M.S., M.B.A.

    Managing Partner, Taiwania Capital Management, Life Science Fund

    Mr. Huang has served as a member of the board of directors of Viracta since 2019. He has been a managing partner at Taiwania Capital Management Company’s Life Science Fund since 2018. Prior to joining Taiwania, Mr. Huang was the Co-founder and Chief Executive Officer of NeuroVive Pharmaceutical Asia, Inc. (NVP Asia). Prior to NPV Asia, Mr. Huang had served as head of investor relations for TWi Pharmaceuticals, Inc., a specialty generics company in Taiwan. Mr. Huang currently serves on the board of directors of Frequency Therapeutics (NASDAQ: FREQ), Elixiron Therapeutics, Inc., Regenacy Pharmaceuticals, Inc., Fractyl Laboratories, Inc. and Point Robotics Medtech, Inc. Mr. Huang earned a M.S. degree in Chemistry from the University of Texas at Arlington and an MBA degree from Rice University’s Jones Graduate School of Business.

  • Sam Murphy, Ph.D

    CEO Salubris Biotherapeutics and VP/Head of International Business Development for Salubris Pharmaceuticals

    Dr. Murphy has served as a member of the board of directors of Viracta since January 2019. He has been a Vice President and Head of International Business Development for Shenzhen Salubris Pharmaceutical Co. Ltd. since 2017, and currently serves as Chief Executive Officer of its United States subsidiary, Salubris Biotherapeutics, Inc. Prior to joining Salubris, Dr. Murphy worked for ten years in strategy consulting and transaction advisory services across several global firms including IMS (now IQVIA) and Simon-Kucher & Partners. Dr. Murphy currently serves on the boards of GO Therapeutics, Inc. (chair) and MedAlliance S.A. Dr. Murphy earned a B.A. in Biochemistry, Ph.D. in Molecular Biology with a concentration in Virology and completed his Post-Doctoral Fellowship in Gene Therapy and Translational Medicine at the University of Pennsylvania.

  • Nicole Onetto M.D.


    Dr. Onetto is a medical doctor and independent consultant in oncology, drug development, and translational research. She was Deputy Director and Chief Scientific Officer at the Ontario Institute for Cancer Research from 2009 to 2016. From 2005 to 2009 she was Chief Medical Officer at ZymoGenetics, a biotechnology company developing protein therapeutics. From 2002 to 2005, she served at OSI Pharmaceuticals, a biopharma company developing targeted cancer therapies, first as Executive Vice President Oncology, and then as Chief Medical Officer. With her team she led the worldwide registration program for Tarceva, one of the first targeted therapies approved for treating cancer patients. Her career in the pharmaceutical industry also includes senior management positions at Bristol-Myers Squibb, Nexstar Pharmaceuticals, which was acquired by Gilead Sciences, and Immunex. Ms. Onetto is also a member of the board of directors of Basilea Pharmaceutica, Sierra Oncology, and of NBE Therapeutics. Previously she served for eleven years as a board member of ImmunoGen. Ms. Onetto earned her BS from the University of Paris, and an MS in Pharmacology from the University of Montréal. She obtained her MD and a Hematology-Oncology Certificate from the University of Paris.

  • Gur Roshwalb, M.D.

    Managing Director at aMoon

    Gur Roshwalb, MD, MBA, is a Managing Director at aMoon with over 20 years of healthcare industry and finance experience. Prior to joining aMoon, he was CEO at several private and public biotech companies. Before moving to industry, Gur was a Vice President at Venrock, where he was an investment professional on the healthcare team investing in both private and public companies. Gur started his finance career at Piper Jaffray, where he worked as a vice president and equity analyst, publishing research on specialty pharmaceutical companies. Prior to Piper, Gur was in private practice in New York following residency training in internal medicine at Mount Sinai Medical Center, where he served as Chief Resident. Gur obtained his medical degree from Albert Einstein College of Medicine of Yeshiva University, his MBA from the NYU Stern School of Business and a B.A. from Columbia University.

  • Stephen Rubino, Ph.D., MBA

  • Barry J. Simon, M.D.

  • Ivor Royston, M.D.

    Director & Chief Executive Officer

    Dr. Royston has served as Chief Executive Officer and President of Viracta since 2015, and has served as a member of Viracta’s board of directors since October 2007. From 1990 to 2017, Dr. Royston was a Managing Partner of Forward Ventures, a life science venture capital firm. From 1990 to 2000, Dr. Royston also held the position of Chief Executive Officer of the Sidney Kimmel Cancer Center. Prior to that, Dr. Royston was the Director of Clinical Immunology at University of California, San Diego Cancer Center. Dr. Royston was the co-founder of Hybritech, Inc., which developed the PSA test for prostate cancer; and the co-founder of IDEC Corporation, which developed a monoclonal antibody therapy for cancer, and which subsequently merged with Biogen to form Biogen Idec, now Biogen. Dr. Royston currently serves on the board of directors of Biocept, Inc. (NASDAQ:BIOC). Dr. Royston received his B.A. and M.D. degrees from Johns Hopkins University and completed post-doctoral training in internal medicine and medical oncology at Stanford University.