Peter Andreas is the John Hay Professor of International Studies. He is the author, co-author, or co-editor of eleven books, including his most recent, Killer High: A History of War in Six Drugs (Oxford University Press, 2020), which explores the relationship between warfare and mind altering substances, from ancient times to the present. Andreas has also written for a wide range of scholarly and policy publications. Other writings include congressional testimonies and op-eds in major newspapers, such as The New York Times, Washington Post, and The Guardian.