Paul Krugman is a professor of economics and international affairs at Princeton University, Centenary Professor at the London School of Economics, and an op-ed columnist for The New York Times. In 2008, he was awarded the Nobel Memorial Prize in Economics "for his analysis of trade patterns and location of economic activity".

Krugman is the author or editor of 20 books and more than 200 professional journal articles, many of them on international trade and finance. In recognition of his work, he received the John Bates Clark Medal from the American Economic Association, an award given every two years to the top economist under the age of 40.

Krugman earned his B.A. in economics from Yale University in 1974 and his PhD from the Massachusetts Institute of Technology in 1977. He taught at Yale University, MIT, UC Berkeley, the London School of Economics, and Stanford University before joining Princeton University in 2000. He also served as a senior international economist for the President's Council of Economic Advisers, under Ronald Reagan.

Paul Krugman has written extensively on international economics, international trade, economic geography, international finance, macroeconomics, and economic policy.

Many models of international trade now follow Krugman's lead, incorporating economies of scale in production and a preference for diversity in consumption, and transportation costs. Many regional and spatial models follow Krugman's contributions to economic geography.

http://nobelprize.org/nobel_prizes/economics/laureates/2008/krugman.html