John Chipman received his Ph.D. from Johns Hopkins University in 1951. He teaches in the areas of Econometrics, International Trade, and Welfare Economics. Professor Chipman's current research involves theoretical and econometric research in international trade and history of utility theory. His recent publications include: Econometrics: "Linear Restrictions, Rank Reduction, and Biased Estimation in Linear Regression", Linear Algebra and Its Applications, Vol. 289 (1 March 1999), 55-74; International Trade: "An Application of Integrability and Duality Theory to the Classical Transfer Problem in International Trade", Zeitschrift fuer Nationaloekonomie/Journal of Economics, Supplement 8, 1999, 241-255.; Welfare Economics: "The Contributions of Ragnar Frisch to Economics and Econometrics", in Econometrics and Economic Theory in the 20th Century: The Ragnar Frisch Centennial Symposium, Econometric Society Monograph Series No. 31 (NY: Cambridge University Press, 1999), 58-101.; Economic Theory & History of Thought: "Irving Fisher's Contributions to Economic Statistics and Econometrics", in The Economics of Irving Fisher (Cheltenham, U.K.: Edward Elgar Publishing, 1999), 173-209.