Professor, 1996-, Department of Mathematics, USF
Associate Professor, 1992-1996, Dept. of Mathematics, USF
Assistant Professor, 1990-1992, Dept. of Mathematics, USF
Visiting Assistant Professor, 1989-1990, School of Math., Univ of Minnesota
Research Assitant Professor, 1988-1999, Dept. of Mathematics, Purdue University
Ph.D. Graduate Student, School of Mathematics, Univ of Minnesota
Lecturer, Institute of Mathematics, Fudan University