Paul Krugman is an American economist, Professor of Economics and International Affairs at Princeton, Centenary Professor at the London School of Economics, and columnist for the New York Times. He won the Nobel Prize in 2008. David Rosenberg is the Chief Economist and Strategist at Gluskin Sheff + Associates Inc. and the former Chief North American Economist at Bank of America-Merrill Lynch. He lives in Toronto. Lawrence Summers has served as Chief Economist of the World Bank, U.S. Secretary of the Treasury, President of Harvard, and as President Obama’s director of the White House National Economic Council. Summers is the Charles W. Eliot University Professor at Harvard University's Kennedy School of Government. Ian Bremmer is the founder and president of Eurasia Group and the author of several books, including the national bestseller The End of the Free Market. He lives in New York and Washington, DC.