Visiting Positions held (visiting period > one month)

Visiting Scholar

1992, National University of Singapore, (NUS), Singapore.

1993, Dept. of Mathematics , Peking University .

1994, The University of Washington, , USA.

1996, ETH Zurich, Switzerland.

1996 The University of Strathclyde, , Scotland.

1997, The Chinese Univ of Hong Kong ( CUHK), Hong Kong ( HK)

Visiting Associate Professor

1995 York University, Canada.

Fall 1996, The Hong Kong Univ of Science and Technology (HKUST), Hong Kong (HK)

1998, University of California at Los Angelas (UCLA), , USA.