David L. Urdal, Ph.D.

Dr. Urdal has served as Chief Scientific Officer and director since joining the Company in July 1995. He served as vice chairman of the Company’s Board of Directors from 1995 to June 2004, as executive vice president from January 1999 through December 2000, as the Company’s president from January 2001 to December 2003, and as senior vice president since June 2004. From 1982 until July 1995, Dr. Urdal held various positions with Immunex Corporation, a biotechnology company, including President of Immunex Manufacturing Corporation, Vice President and Director of Development, and head of the departments of biochemistry and membrane biochemistry. Dr. Urdal serves as a director of VLST, a biotechnology company and ORE Pharmaceuticals, Inc., a pharmaceutical drug repositioning and development company. Dr. Urdal’s biotechnology and pharmaceutical industry board and senior management experience, including his long-term senior management role with the company, together with his scientific expertise and background give him the valuable and appropriate qualifications to serve as a member of our Board. Dr. Urdal received a B.S. in zoology, a M.S. in Public Health and a Ph.D. in Biochemical Oncology from the University of Washington.