Roger Aliaga-Díaz is a senior economist with The Vanguard Group, Inc.'s Investment Strategy Group. His areas of expertise are monetary policy, international macroeconomics, and finance. He has published studies on investment and macroeconomic issues in peer-reviewed academic journals and presented his research at various industry and academic conferences including the Board of Governors of the Federal Reserve System, the American Enterprise Institute for Public Policy Research, and the American Economic Association. Before joining Vanguard in 2007, Mr. Aliaga-Díaz was a visiting professor of macroeconomics at Drexel University's LeBow College of Business. He earned a B.A. in economics from Universidad Nacional de Córdoba, Argentina, and a Ph.D. in economics from North Carolina State University.