Employment History

Appointments

• Director, Center for the Computation and Visualization of Geometric Structures, 1994-present.
• Head, School of Mathematics, University of Minnesota, 1986-1990.
• Professor, University of Minnesota, 1979-present.
• Associate Professor, University of Minnesota, 1975-1979.
• Assistant Professor, University of Minnesota, 1970-1975.
• Postdoctoral Fellow, Courant Institute of Mathematical Sciences, 1969-1970.
• Instructor, University of Wisconsin, 1969.

Visiting Appointments

• Ulam Professor, University of Colorado, Boulder, 1990-91.
• Professor, Institute of Pure and Applied Mathematics, Rio de Janeiro, 1985.
• Professor, Mittag-Leffler Institute, 1984.
• Professor, Mathematics Research Institute, ETH, Zurich, 1980-81.
• Professor, Mathematics Research Center, Madison, Wisconsin, 1979.
• Associate Professor, Mathematics Research Center, Madison, Wisconsin, 1977.
• Associate Professor, Courant Institute of Mathematical Sciences, 1976.