Professor Joel Mokyr is an expert on the economic history of Europe, and specializes in the period 1750- 1914. His current research is concerned with the understanding of the economic roots of technological progress and the growth of useful knowledge in European societies, as well as the impact that industrialization and economic progress have had on economic welfare. He is interested in evolutionary theories of technological change institutions, and is completing a book entitled Neither Chance nor Necessity, on the evolutionary aspects of technological progress. He is editor-in-chief of the Princeton University Press Economic History of the Western World, and the Oxford University Press Encyclopedia of Economic History.