Harold Hillman is the Managing Director of Sigmoid Curve Consulting Group. The sigmoid curve is an algebraic formula that shows how growth and momentum are best sustained by disrupting the status quo. Based in New Zealand since 2003 and now a New Zealand citizen, Hillman coaches business leaders and executive teams to appreciate the strong relationship between leadership and learning. He believes that the best leaders are also the most skilled learners. Prior to Sigmoid, Hillman served in senior executive roles with Fonterra, Prudential Financial, and Amoco Corporation. Trained early in his career as a clinical psychologist, he moved in the direction of leadership and management development after serving on the faculty at the United States Air Force Academy. Hillman earned his EdM from Harvard University and a PhD in Clinical Psychology from the University of Pittsburgh. An optimist who believes that change is a gift, Hillman lives every day through the prism of opportunity and possibility.