Michael Bates has been a member of the board of directors since August 2007. From January 2005 to January 2007, Mr. Bates served as Chief Financial Officer of St. Francis Medical Technologies, Inc., a medical device company, which was acquired by Kyphon Inc. in January 2007. From April 2000 to October 2004, Mr. Bates served as Vice President of Finance and Administration and Chief Financial Officer of Silicon Genetics, a bioinformatics company. From January 1999 to February 2000, Mr. Bates served as Vice President of Finance and Chief Financial Officer of Collagen Aesthetics, Inc., a medical device company. From 1995 to 1998, Mr. Bates served in various financial positions at Penederm, Inc., a dermatology pharmaceutical company, most recently as its Chief Financial Officer. Mr. Bates also serves on the boards of BARRX Medical, Inc., a privately held medical device company, and Satiety, Inc., a privately held company developing tools to treat obesity. Mr. Bates is a C.P.A., and holds a B.S. in Business Administration from California State University, East Bay and an M.B.A. in Finance from the University of California at Berkeley.