Ernest Richard May was an American historian of international relations whose 14 published books include analyses of American involvement in World War I and the causes of the fall of France during World War II. His 1997 book The Kennedy Tapes: Inside the White House During the Cuban Missile Crisis became the primary sources of the 2000 film Thirteen Days that viewed the crisis from the perspective of American political leaders. He served on the 9/11 Commission and highlighted the failures of the government intelligence agencies. May taught full time on the faculty of Harvard University for 55 years, until his death.