Henry Kissinger, the former Secretary of State known for his realist approach to foreign policy during the Nixon and Ford administrations, has died. He was 100. News of his death was confirmed by a statement from his consulting firm. Kissinger was a highly influential but polarizing figure. His impact extended beyond his tenure as national security adviser from 1969 to 1975 and overlapping/concurrent service as Secretary of State from 1973 to 1977, for decades spanning from the Vietnam War to the aftermath of 9/11.