Defense Secretary Robert McNamara tasked him with creating an encyclopedic history of the war, which became known as the Pentagon Papers.

She became suspicious when she discovered large deposits in the bank account of Aldrich Ames, whose betrayal cost the lives of at least eight double agents.

© Nikki Kahn/The Washington Post, via Getty Images

She became suspicious when she discovered large deposits in the bank account of Aldrich Ames, whose betrayal cost the lives of at least eight double agents.

© Nikki Kahn/The Washington Post, via Getty Images

At the U.N., he took on some of the world’s most challenging health crises in troubled areas, skillfully coordinating international efforts to reduce the spread of disease

© Timothy A. Clary/Agence France-Presse — Getty Images