Dr. Stack has served on our board of directors since March 2008. Dr. Stack has been a partner at Kleiner Perkins Caufield & Byers, a venture capital firm, since 2003. From 1996 to 2003, she was a principal at J.P.Morgan Partners, LLC, a private equity division of JPMorgan Chase & Co. From 1990 to 1996, Dr. Stack was a derivative specialist on the Chicago Board of Trade. Dr. Stack currently serves on the board of directors of the privately held companies, Cardio Dx, Inc., Nodality, Inc. and Nexus Dx, Inc., and is a board observer at Epizyme Corporation, Veracyte, Inc., Tethys Biosciences, Inc. and Pacific Biosciences, Inc. Dr. Stack holds a B.S. in Genetics and Development with distinction from the University of Illinois and a Ph.D. in Immunology from the University of Chicago.