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Summary: Derek Chollet, author most recently of “The Long Game: How Obama Defied Washington and Redefined America’s Role in the World”, was an Assistant Secretary of Defense in the Obama administration. He’s now Executive Vice President at the German-Marshall Fund. In this podcast with Perry World House Director Bill Burke-White, Chollet discusses strategy differences between Obama and Trump, what makes for a great Secretary of State, and the most important challenges facing the world.