Hugh Linehan speaks with American author, historian and academic Timothy Snyder about his book On Tyranny: Twenty Lessons from the Twentieth Century, in which he makes provocative and unsettling comparisons between today's politics and the rise of the Third Reich and suggests how we can avoid the terrible mistakes of the past.

Timothy Snyder is a professor of history at Yale University and a permanent fellow at the Institute for Human Sciences in Vienna. He has spent ten years in Europe, and speaks five and reads ten European languages. He has also written for The New York Review of Books, Foreign Affairs, The Times Literary Supplement, The Nation, and The New Republic as well as for The New York Times, The International Herald Tribune, The Wall Street Journal, and other newspapers.

He is the author of several award-winning books including The Red Prince: The Secret Lives of a Habsburg Archduke, Bloodlands: Europe Between Hitler and Stalin, and Black Earth: The Holocaust as History and Warning.