To Lead the World: American Strategy after the Bush Doctrine 2008 HKS Authors See citation below for complete author information. Samantha Power Anna Lindh Professor of the Practice of Global Leadership and Public Policy, HKS; William D. Zabel 1961 Professor of Practice in Human Rights, HLS Citation Power, Samantha. "Legitimacy and Competence." To Lead the World: American Strategy after the Bush Doctrine. Ed. Melvyn P. Leffler and Jeffrey W. Legro. Oxford University Press, 2008, 133-156.