Research Associate with Peter J. W. Debye, Cornell University                        1958-1962

Assistant Professor of Chemistry, University of Kansas                                      1962-1965

Associate Professor of Chemistry, University of Kansas                                    1965-1968

Professor of Chemistry, State University of New York at Stony Brook               1968-1988

Chairman,                                                                                                                  1978-1985

Professor of Materials Science and Engineering                                                 1982-

Leading Professor of Chemistry, SUNY/Stony Brook                                          1988

Distinguished Professor, SUNY/Stony Brook                                                       1992-

Brookhaven National Laboratory                                                                       Summer, 1957

Univ. of New South Wales, Australia                                                                 Summer, 1974 & 1994

Australian National University                                                                            Summer, 1974

Wayne State University, Detroit                                                                         May-June, 1975

Hokkaido University, Japan                                                                               July-Sept, 1975

Peking University, Fudan University, PR China                                               August, 1979 & 1982

Institute for Theoretical Physics,                                                                         December, 1982

Univ. of Calif., Santa Barbara

External Examiner in Chemistry,                                                                       1986-1989

Chinese University of Hong Kong

Science Advisory Committee, Hong Kong University of Science and Technology   1995-1997

Chinese American Chemical Society, Board of Directors                               1995-1997

Member of the St. Norbert College Board of Trustees                                      2004-2009

Academic Advisory Committee, Institute of Chemistry,   Academia Sinica, Taipei, Taiwan                 2005-2008

1. Calgon Corporation, Subsidiary of Merck & Co., Inc., Pittsburgh, PA

2. Brookhaven Instruments, Holtsville, New York.

3. Universities Space Research Association (USRA), Microgravity Science &  Applications Division, NASA.

4. Eastman Kodak Company, Eastman Chemicals Division, Kingsport, Tennessee.

5. Roche Diagnostic Systems, Division of Hoffmann‑LaRoche, Inc., Nutley, New Jersey.

6. Bristol‑Myers Squibb Company, The Squibb Institute for Medical Research, New Brunswick, New Jersey.

7. DuPont Experimental Station, Wilmington, Delaware

8. W. L. Gore & Associates, Inc., Elkton, Delaware.

9.  Dow Chemical Company, Freeport, Texas.