Management

Lewis T. "Rusty" Williams, M.D., Ph.D.

Founder, President and CEO

Dr. Williams founded the company in December 2001 and has served as a member of our board of directors since January 2002, as our President and Chief Executive Officer since August 2011, and as our Executive Chairman from July 2003 to January 2012. Previously, Dr. Williams spent seven years at Chiron Corporation, a biopharmaceutical company, now Novartis Vaccines and Diagnostics, Inc., most recently as its Chief Scientific Officer. He also served on Chiron’s board of directors from 1999 to 2001. Prior to joining Chiron, Dr. Williams was a professor of medicine at the University of California, San Francisco and served as director of the University’s Cardiovascular Research Institution and Daiichi Research Center. Dr. Williams also has served on the faculties of Harvard Medical School and Massachusetts General Hospital and co-founded COR Therapeutics, Inc., a biotechnology company focused on cardiovascular disease. He is a member of the National Academy of Sciences and a fellow of the American Academy of Arts and Sciences. Dr. Williams was previously a member of the boards of directors of COR Therapeutics, Inc. and Beckman Coulter, Inc., each of which was a public company. Dr. Williams received a B.S. from Rice University and an M.D. and a Ph.D. from Duke University.

Aron Knickerbocker

Executive Vice President and Chief Business Officer

Mr. Knickerbocker has served as our Executive Vice President since August 2015, as our Chief Business Officer since April 2012 and as a member of our board of directors since October 2013. From September 2009 to April 2012, he served as our Vice President, Business Development. From 2001 to September 2009, Mr. Knickerbocker served at Genentech, Inc. in positions of increasing responsibility most recently as Senior Director, Business Development from 2005 to September 2009. Prior to 2001, Mr. Knickerbocker served as Director of Commercial Development at ALZA Corporation, a pharmaceutical company acquired by Johnson & Johnson, as Senior Manager, Corporate Development at Amgen Inc., a public biotechnology company and as a scientist at Bristol-Myers Squibb Company, a public biopharmaceutical company. Mr. Knickerbocker received an A.B. in biology from Washington University in St. Louis and an M.B.A. from the University of Michigan.

Francis Sarena

Executive Vice President, General Counsel and Secretary

Mr. Sarena has served as our Executive Vice President since August 2015 and as General Counsel and Secretary since December 2010. Mr. Sarena also served as Senior Vice President from January 2013 to August 2015 and as Vice President from December 2010 to January 2013. From December 2008 to July 2010, Mr. Sarena served as Vice President, General Counsel and Secretary of Facet Biotech Corporation, a public biotechnology company that was spun off from PDL BioPharma, Inc. in December 2008 and was later acquired by Abbott Laboratories in April 2010. From April 2006 to December 2008, Mr. Sarena served at PDL BioPharma, Inc. in positions of increasing responsibility, most recently as Vice President, General Counsel and Secretary from June 2008 to December 2008. Prior to April 2006, Mr. Sarena served as an associate at Bingham McCutchen LLP where he represented public and private life science and high tech clients primarily in merger and acquisition transactions, corporate and securities law matters and equity financing transactions. Mr. Sarena received a B.S. in Finance from San Francisco State University and a J.D. from University of California, Berkeley.

Kevin Baker, Ph.D.

Senior Vice President, Development Sciences

Dr. Baker has served as our Senior Vice President, Development Sciences since February 2016 and served in positions of increasing responsibility, most recently as our Vice President, Preclinical Development, from January 2006 to July 2015. From July 2015 to January 2016, Dr. Baker served as Senior Vice President, Preclinical Development at Audentes Therapeutics, Inc., a privately held biotechnology company. From 2000 to 2006, Dr. Baker served at Human Genome Sciences, a biopharmaceutical company that was acquired by GlaxoSmithKline, in positions of increasing responsibility, most recently as Associate Director in the Department of Antibody Discovery and Development. From 1992 to 1999, Dr. Baker served as a Scientist at Genentech. From 1987 to 1992, Dr. Baker served as a Postdoctoral Fellow at the University of Basel in Switzerland. Dr. Baker received a B.Sc. from the University of Salford in England and a Ph.D. from the University of Dundee in Scotland.

Marc Belsky

Senior Vice President and Chief Financial Officer

Mr. Belsky has served as our Senior Vice President and Chief Financial Officer since December 2013. Mr. Belsky also served as our Vice President and Chief Financial Officer from October 2013 to December 2013 and as our Vice President, Finance from October 2009 to October 2013. From December 2006 to October 2009, Mr. Belsky served as Vice President, Finance, and Chief Accounting Officer of Cell Genesys, Inc., a biotechnology company acquired by BioSante Pharmaceuticals, Inc. Prior to 2006, Mr. Belsky served as Vice President, Global Visa Commerce at Visa Inc., Chief Financial Officer at Active Aero Group, Inc. and Chief Financial Officer at DataWave Systems Inc. Prior to these positions, he served for 15 years at Michigan National Corporation, a holding company for Michigan National Bank, which was acquired by BANA Holding Corporation, in positions of increasing responsibility, most recently as Senior Vice President, U.S. Payment Products and Services. Mr. Belsky started his career as an auditor with Coopers & Lybrand. Mr. Belsky received a B.S. in Accounting from Wayne State University and an M.B.A. from the University of Michigan. He is a certified public accountant, a chartered global management accountant and a certified treasury professional.

Lauretta Cesario

Senior Vice President, Human Resources

Ms. Cesario has served as our Vice President, Human Resources, since August 2009. From 2001 to 2006, Ms. Cesario served as Vice President, Human Resources at Affymetrix, Inc. From 1997 to 2001, Ms. Cesario served as Vice President, Human Resources at Scios, Inc. Prior to 1997, Ms. Cesario served for 18 years in human resources positions of increasing scope and responsibility at Silicon Graphics, Inc., National Semiconductor Corporation, Syntex Corporation and Bank of America. Ms. Cesario received a B.S. in Psychology from Loyola University.

Robert Sikorski, M.D., Ph.D.

Senior Vice President, Global Clinical Development

Dr. Sikorski has served as our Senior Vice President of Global Clinical Development since January, 2016. Dr. Sikorski also served as our Vice President of Global Clinical Development from September 2014 to January 2016. From December 2010 to September, 2014, Dr. Sikorski served as Senior Director, Global Oncology Research and Development at Medimmune a wholly owned subsidiary of AstraZeneca, a public biotechnology company. From March 2006 to December 2010, Dr. Sikorski served as Director, Global Oncology Research and Development at Amgen. From March 2006 to December 2010, Dr. Sikorski served as Director, Global Oncology Research and Development at Amgen. From October 2004 to March 2006, Dr. Sikorski served as a medical affairs consultant to Genzyme. From 1998 to 2003, Dr. Sikorski served as Chief Technology Officer at Mednav, Inc., a biomedical data acquisition and analytics firm. From 1994 to 1997, Dr. Sikorski served as a Howard Hughes Research Fellow and Visiting Scientist at the National Cancer Institute and the National Human Genome Research Institute. Dr. Sikorski received his M.D. and Ph.D. from The Johns Hopkins University School of Medicine. He completed his residency at Massachusetts General Hospital and completed an oncology fellowship at The Johns Hopkins Oncology Center. Dr. Sikorski is board certified in both oncology and internal medicine.

Luis Borges, Ph.D.

Vice President, Immuno-Oncology Research

Dr. Borges has served as our Vice President, Immuno-Oncology Research, since July 2015. From February 2015 to July 2015 he served as our Executive Director, Immuno-Oncology Validation, and from May 2014 to February 2015 he served as our Senior Director, Translational Immunology. From 2002 to May 2014, Dr. Borges served in positions of increasing responsibility at Amgen Inc., most recently as Scientific Director, Therapeutic Innovation Unit. From 1996 to 2002, Dr. Borges served at Immunex Corporation initially as a Postdoctoral Scientist and later as a Staff Scientist. Immunex was acquired by Amgen in 2002. Dr. Borges received a B.S. from the University of Lisbon and a Ph.D. in Pathology from University of Washington.