He is the Class of 1950 Professor of Economics at the University of California, Berkeley and Director of the Labor Studies Program at the NBER. His research interests include immigration, wages, education and gender-and race-related differences in the labor market. He was co-editor of “Econometrica” (1991-1995) and the “American Economic Review” (2002-2005). He taught at Princeton University (1983-1996), and has held appointments as Visiting Professor at Columbia, Harvard and the Center for Advanced Study in the Behavioral Sciences.
He has received numerous awards including the John Bates Clark Prize in 1995.
In 1995 he was co-author of the book Myth and Measurement: The New Economics of the Minimum Wage, and co-editor of The Handbook of Labor Economics (1999), Seeking a Premier Economy: The Economic Effects of British Economic Reforms (2004); and Small Differences that Matter: Labor Markets and Income Maintenance in Canada and the United States (1992).