Henry Kissinger, who served as national security adviser and secretary of state in the administrations of U.S. Presidents Richard Nixon and Gerald Ford (the only person to hold both roles at the same time), was among the most influential diplomats on the world stage in the second half of the 20th century and also among the most controversial. A German Jewish immigrant whose family fled the Nazis, he became a political scientist and Harvard professor after serving in the U.S. Army during World War II. As a diplomat, he was frequently characterized as a practitioner of realpolitik and was known for favoring pragmatism over moral and ethical considerations. His admirers point to his contributions in advancing détente with the Soviet Union, initiating the Strategic Arms Limitation Talks (SALT), and opening direct relations with the People’s Republic of China. His critics condemn his role in the secret bombing of Cambodia during the late stages of the Vietnam War, his advocacy of policies that contributed to or condoned the deadly antidemocratic activities of right-wing Latin American governments, and the atrocities committed by the Pakistani army in 1971 in what would become Bangladesh. The complexity of his legacy can be summed up by the fact that he was a Nobel Peace Prize winner who was also branded by some as a war criminal. Learn more about this complex figure in this life in pictures interactive feature.