Who were David Allen's mentors?

David Allen mentions two important mentors who significantly contributed to the formation of his "Getting Things Done" (GTD) methodology. The first mentor is Dean Atchison, who influenced him through executive consulting and organizational change, teaching Allen about the importance of a mind sweep and making next action decisions. The second mentor, Russell Bishop, contributed to Allen's understanding of commitments and personal growth through his work as the co-founder of Insight Seminars 1 .