Donald W. K. Andrews is the William K. Lanman Jr. Professor of Economics in the Department of Economics at Yale University. The author of more than 70 professional publications, Professor Andrews is a Fellow of the Econometric Society, former co-editor of the journal Econometric Theory, and is a Fellow of the Journal of Econometrics. He did his graduate work at the University of California, Berkeley, where he obtained an MA in Statistics and a PhD from the Economics Department under the supervision of Peter J. Bickel and Thomas J. Rothenberg.