Born in England in 1944, Karen Armstrong is a TED Prize-winning scholar of comparative religion best known for her bestselling 1993 volume "A History of God." A Catholic nun from 1962 through 1969, she left the order to become a student of English literature at Oxford amidst a struggle with then-undiagnosed epilepsy, a period of her life discussed in her 2004 autobiography "The Spiral Staircase." In 2008 she called for a council of world religious leaders to draw up a "Charter for Compassion" based on the moral principles embodied in the Golden Rule. In November 2009, she unveiled the Charter in Washington, DC and online.