Leadership by the NumberPraise for Leadership by the Number "Jon Singletary is a first rate scholar of introspective leadership and how the Enneagram can help us lead and serve more effectively. Leadership by the Number helps all of us become more balanced in head, heart, and hand, and, in doing so, to discover ways to lead from a stronger, more centered sense of self." D. Michael Lindsay, President, Taylor University "With cogency and vulnerability, Jon Singletary invites