1994¡ª present Full Professor (associate and assistant professor), Department of Mathematics and Statistics, Sam Houston State University, Huntsville, Texas
1993¡ª1994 Visiting Professor, Department of
Mathematics,
1989¡ª1991, 1992-1993 Visiting Senior Researcher of Center of Approximation Theory, Department of Mathematics, Texas A & M University, College Station, Texas
10/1988 ¨C 09/1989 Visiting Professor, Department of
Mathematics, Ohio State University at Columbus
1982¡ª1994 Full professor (associate and assistant professor), Department of Mathematics, Wuhan University, China