1970-1972 Associate Research Scientist, New York University
1972-1973 Visiting Fellow, Tata Institute of Fundamental
Research, Bombay, India
1974-1977 Assistant Professor, Louisiana State University, Baton Rouge
1978-1981 Associate Professor, Louisiana State University, Baton Rouge
1978-1979 Visiting Associate Professor, Yale University
1981-present Professor, Louisiana State University, Baton Rouge
1983 Visiting Professor, Raman Research Institute,
Bangalore, India, and Tata Institute of Fundamental Research, Bombay,
India
1984 Visiting Fellow, Joint Institute for Laboratory
Astrophysics, Boulder, Colorado
1987-1988 Visiting Professor, Australian National University, Canberra
1999 Humboldt Preistraeger and Visiting Professor,
University of Bielefeld and University of Freiburg, Germany
2000 Visiting Professor, Tata Institute of Fundamental
Research, Bombay, and Raman Research Institute, Bangalore, India
Visiting Professor, Australian National University,
Canberra, Australia
