Phillips Payson O'Brien is a Professor of Strategic Studies at the University of St. Andrews in Fife, Scotland. Born and raised in Boston, he graduated from Trinity College in Hartford, Connecticut, before working on Wall Street for two years. He earned a PhD in British and American politics and naval policy before being selected as Cambridge University's Mellon Research Fellow in American History, and a Drapers Research Fellow at Pembroke College. Formerly at the University of Glasgow, he moved to St. Andrews in 2016. O’Brien is the author of The Second Most Powerful Man in the World and How the War Was Won.