His research interests include U.S. diplomatic and economic history, twentieth century global politics, and the history of classical economics. After receiving his PhD in history from the University of Pennsylvania and prior to joining the Stern School, Professor Brennan worked as an equity analyst and portfolio manager covering the financial services industry for several asset management firms and hedge funds. Before his career as an investor, Professor Brennan was a CPA at Price Waterhouse and has served on the boards of the Bank and Financial Analyst Association, the Rude Mechanicals Theater Company, and policy think tanks. Professor Brennan is also the American editor of the Quarterly Review, a British literary magazine founded in 1809.