George Mahaffey

Chief Executive Officer

Mr. Mahaffey has served as our Chief Executive Officer since November 2009 and as our Chief Commercial Officer and Vice President, Sales & Marketing since May 2007.

Previously, from March 2004 to January 2007, Mr. Mahaffey was the Senior Vice President, Sales & Marketing at CoTherix, Inc., a biopharmaceutical company acquired by Actelion Ltd, a biopharmaceutical company, in 2006. From April 2000 to March 2004, Mr. Mahaffey served as Senior Director, Marketing & Business Development at Scios Inc., a biopharmaceutical company acquired by Johnson & Johnson in 2003. Prior to April 2000, Mr. Mahaffey held various sales, marketing and management positions at Neurex, Inc., a biotechnology company acquired by Elan in 1999, and DuPont, a chemicals and health care company.

Mr. Mahaffey received a B.S. in chemical engineering at the University of Delaware and an M.B.A. from the University of South Florida.