Committee Composition

Chair of the Board = Chair of the Board Committee Chair = Chair Committee Member = Member Independent Director = Independent Director
  Audit Nominating and Governance Compensation
Tim Sullivan      
Charles M. Boesenberg Chairman of the Board Independent Director Member of Audit Committee Committee Chair for Nominating and Governance Committee Committee Chair for Compensation Committee
David Goldberg Independent Director   Member of Nominating and Governance Committee  
Thomas Layton Independent Director     Member of Compensation Committee
Elizabeth Nelson Independent Director Committee Chair for Audit Committee   Member of Compensation Committee
Victor Parker      
Mike Schroepfer Independent Director     Member of Compensation Committee
Ben Spero      
Dr. Paul R. Billings Independent Director Member of Audit Committee    
Director

Dr. Paul R. Billings has served as one of our directors since May 2012. Since October 2010, Dr. Billings has been the Chief Medical Officer at Life Technologies Corporation. Prior to joining Life Technologies, he was Director and Chief Scientific Officer of the Genomic Medicine Institute at El Camino Hospital, from January 2009 to September 2010. From November 2007 to January 2009, Dr. Billings was the Chief Executive Officer of CELLective Dx Corporation. From October 2002 to September 2007 he was Senior Physician and Senior Vice President for Corporate Development at Laboratory Corporation of America Holdings (LabCorp). Dr. Billings holds an M.D. and Ph.D. in Immunology from Harvard University and a B.A. from the University of California at San Diego.