Board of Directors

Clay B. Siegall, Ph.D.

Chairman and Chief Executive Officer, Seattle Genetics, Inc.


Dr. Siegall joined Ultragenyx as a board member in January 2014. Dr. Siegall currently serves as President and Chief Executive Officer and Chairman of the Board of Seattle Genetics, Inc. Dr. Siegall co-founded Seattle Genetics in 1998. Prior to Seattle Genetics, Dr. Siegall worked for the Bristol-Myers Squibb Pharmaceutical Research Institute from 1991 to 1997 and the National Cancer Institute, National Institutes of Health from 1988 to 1991. Dr. Siegall serves on the Boards of Directors of Alder BioPharmaceuticals and Mirna Therapeutics, two private biotechnology companies.  Dr. Siegall received a B.S. in Zoology from the University of Maryland and a Ph.D. in Genetics from George Washington University.