Gergen was 83 years old. His son, Christopher, told The New York Times on Friday that Gergen's death was caused by Lewy body dementia. Gergen first began working at the White House in 1971, ...

David Gergen, a former political analyst and consultant to four American presidents, has died. He was 83. His son, Christopher, confirmed to the New York Times that Gergen died of Lewy body dementia ...