Gallup's in-house publishing division, Gallup Press, has published approximately 30 books on business and personal well-being-related themes.[65] Noteworthy titles include: First, Break All the Rules: What the World's Greatest Managers Do Differently;[31] How Full Is Your Bucket?, written by Gallup senior scientist Tom Rath[66] and his grandfather, Don Clifton,[67] founder of SRI;[68] and Now, Discover Your Strengths, updated to a new version called StrengthsFinder 2.0 in 2007,[69] which is among Amazon's 20 bestselling books of all-time as of 2017.[70]