Biography Ann Thornburg has been a director of our company since November 2006. From October 1982 until September 2006, Ms. Thornburg was a partner at PricewaterhouseCoopers LLP, an auditing firm. At PricewaterhouseCoopers LLP, she served in a variety of client service and management roles, including acting as audit partner for major health care clients. From 2001 to 2005, Ms. Thornburg was a member of the U.S. Board of Partners and Principals of PricewaterhouseCoopers LLP.