Mary P. Ricciardello, 64, 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 served in various financial management positions with Reliant, including comptroller, vice president and most recently as senior vice president and chief accounting officer. She is a certified public accountant and serves on the board of directors of Noble Corp. She holds a bachelor’s in business administration from the University of South Dakota and a master’s in business administration from the University of Houston.