Mr. Fust has served as a member of the Ultragenyx Board since January 2014. Currently, he is a Board member and an advisor to life sciences companies. Mr. Fust served as Executive Vice President and Chief Financial Officer of Onyx Pharmaceuticals, Inc. from January 2009 until January 2014, when he retired. From May 2003 to December 2008, Mr. Fust served as Chief Financial Officer of Jazz Pharmaceuticals, Inc. From 2002 to 2003, Mr. Fust served as Chief Financial Officer at Perlegen Sciences. Previously, he was Senior Vice President and Chief Financial Officer at ALZA Corporation, where he was an executive from 1996 until 2002. From 1991 until 1996, Mr. Fust was a manager in the healthcare strategy practice at Andersen Consulting. Mr. Fust serves on the Board of Directors of Atara Biotherapeutics, Inc., and Crinetics Pharmaceuticals, Inc. Mr. Fust received a B.A. from the University of Minnesota and an M.B.A. from the Stanford Graduate School of Business.