There’s a lingering question on the minds of successful people everywhere: Is there more for me to do in this world? When Bob Buford’s book “Halftime” published in 1995, it started a movement around answering that question. It was one of those rare books that caught the crest of a cultural wave and then rode it into great notoriety. The book sold almost a million copies, and it confirmed what Bob and his mentor, Peter Drucker, believed about the changing world of work and how the next…