Jim Wallis is a preacher, an activist, an author, the convener of Call to Renewal, and the editor in chief of Sojourners magazine. His previous books include Who Speaks for God?, The Soul of Politics, and The Call to Conversion. He has just completed a year as a fellow at the new Center for the Study of Values in Public Life at Harvard Divinity School and now teaches at the university's John F. Kennedy School of Government. Wallis travels extensively, giving more than two hundred talks each year. He lives in Washington, D.C., with his wife, Joy, and son, Luke.