Sister Lillian Murphy, Mercy's CEO for 20 of its 26-year history, is indeed a formidable force when it comes to championing the cause of low-income housing. “She's not afraid to stand toe-to-toe with congressmen,” notes Shekar Narasimhan, managing partner for Beekman Advisors, a Virginia consulting firm. “With its size and breadth of its product, Mercy is one of the nation's most influential organizations focusing on affordable housing.”