Mary P. Ricciardello, 53, joined the board of directors in 2007. She retired in 2002 after a 20-year career with Reliant Energy Inc., a leading independent power producer and marketer. Ricciardello began her career with Reliant in 1982 and served in various financial management positions with the company including comptroller, vice president and most recently as senior vice president and chief accounting officer. She serves on the boards of U.S. Concrete and Noble Corp. and is a Certified Public Accountant.