Jon Walker has worked closely with Rick Warren for many years, first as a writer/editor, later as vice president of communications at Purpose Driven Ministries, and then as a pastor at Saddleback Church.
He's also served as editor-in-chief of LifeWay's HomeLife magazine and founding editor of Rick Warren's Ministry Toolbox.
He is the author of Costly Grace: A Contemporary View of Bonhoeffer's The Cost of Discipleship. His articles have appeared in publications and websites around the world. He lives in Nashville, Tennessee.