Paul Krugman is a Neo-Keynesian economist, Nobel laureate, academic, author, and media columnist, known for his work on international trade theory and economic geography. Considered one of the world's most influential economists, Krugman is renowned for redefining existing theories of international trade and either founding or co-founding several new disciplines in international economics, from New Trade Theory (NTT) and New Economic Geography (NEG) to models of financial crises and exchange rate movements. In 2008, Krugman was the sole recipient of the Nobel Memorial Prize in Economic Sciences "for his analysis of trade patterns and location of economic activity."