Timothy Snyder is the Richard C. Levin Professor of History at Yale University. He is the author of a number of works of European history, including Bloodlands: Europe Between Hitler and Stalin and Black Earth: The Holocaust as History and Warning. He appears regularly in both Europe and the United States as a commentator on politics and history. With the recent publication of On Tyranny, he has been engaged in public work in American civics. His next book, The Origins of Unfreedom, will be published in April 2018.

Gabriel Ehri is executive director of Friends Journal.