Throughout Joseph Stiglitz's long and distinguished career in economics, the focus has been on the real world, with all of its imperfections. His 2001 Nobel Prize recognized his pioneering research in imperfect information; his work in other areas, including macroeconomics, public economics, and development economics, has been just as influential. This volume, a collection of essays written to mark Stiglitz's sixtieth birthday, reflects the wide- ranging influence of "Stiglitzian" economics. The many distinguished contributors are his teachers, students, and coauthors; their participation testifies to the personal and professional impact of Joseph Stiglitz's contributions to contemporary economic thought. Contributors George A. Akerlof, Franklin Allen, Richard Arnott, A.B. Atkinson, Kenneth Arrow, Costas Azariadis, Kaushik Basu, David L. Bevan, Robin Boadway, Margaret Bray, William Brock, Partha Dasgupta, Paul David, Avinash Dixit, Aaron S. Edlin, Joseph Farrell, Douglas Gale, Mark Gersovitz, Richard J. Gilbert, Jacob Glazer, Bruce Greenwald, Geoffrey Heal, Karla Hoff, Dwight Jaffee, Ravi Kanbur, Michael L. Katz, Luisa Lambertini, Jonathan Levin, Richard Levin, Karl-Göran Mäler, Serge Moresi, Barry Nalebuff, J. Peter Neary, David M. Newbery, Pierre Pestieau, Pierre Picard, Patrick Rey, Andrew K. Rose, Thomas Russell, Paul A. Samuelson, Raaj Sah, Steven Salop, Robert M. Solow, Nicholas Stern, Anthony J. Venables, Kenji Wada, Jörgen W. Weibull, Andrew Weiss, Anastasios Xepapadeas, and Janet L. Yellen.