Professional Positions

The University of Iowa, Department of Mathematics

1999-present, Professor
1994-1999, Associate Professor
1990-1994, Assistant Professor

The University of Iowa, Department of Radiology

2004-present, Professor

The University of Hong Kong, Department of Mathematics

1999, Honorary Associate Professor

Shandong University, Department of Mathematics

2008-present, Chang Jiang Chair Professor
2003-present, Li-Ching Chair Professor
1998-present, Professor

Cornell University, Department of Mathematics

1988-1990, H.C. Wang Assistant Professor

Johns Hopkins University, Department of Mathematics

1987-1988, Visiting Assistant Professor

Institute for Advanced Study, School of Mathematics

1986-1987, Member

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