 As part of Gallup, Buckingham became a member of a team working on a survey that measured a broad range of factors that contribute to employee engagement.Based on those surveys and on interviews with thousands of managers, Buckingham published (with coauthor Curt Coffman) "First, Break All the Rules" (Simon and Schuster, 1999).According to its subtitle, the book describes "what the world's greatest managers do differently" The book became a New York Times best-seller and has over a million copies in print.