BIOGRAPHY OF JEFF CHEEGER Jeff Cheeger was born on December 1, 1943 in Brooklyn N.Y. He graduated from Harvard in 1964 and received his Ph. D. from Princeton in 1967. After one year stays at the University of California, Berkeley, and the University of Michigan, he joined the mathematics department at SUNY Stony Brook. Since 1989, he has been a member of the Courant Institute. Cheeger has been the recipient of NSF Postdoctoral, Sloan and Guggenheim fellowships, and a Max Planck Research Award from the Alexander von Humboldt Society, 1991. He recieved the Oswald Veblen Prize in geometry from the American Mathematical Society, 2001. Cheeger gave invited addresses at the International Congress of Mathematicians, 1974, 1986, the Marston Morse Lectures at the Institute for Advanced Study, 1992, the Blyth Lectures at the University of Toronto, 1997, the Andrejewski Lectures at the University of G\"ottingen, 1997, the Rado Lectures at Ohio State University, 1999, the Roever Lecture at Washington University and the Yamabe Lecture at the University of Minnesota, 2000. He will give the Fermi Lectures at the Scuola Normale Superiore, Pisa, 2001. He is a member of the National Academy of Sciences and a Foreign Member of the Finnish Academy of Science and Letters.