Timothy Snyder is Levin Professor of History at Yale University, and has written and edited a number of critically acclaimed and prize-winning books about twentieth-century European history: his most recent book,On Tyranny, was an international bestseller.

Previous books include Black Earth, which was longlisted for the Samuel Johnson Prize; and Bloodlands, which won the Hannah Arendt Prize, the Leipzig Book Prize for European Understanding, the Ralph Wa...