Professor of Physics, University of Notre Dame, 1958-present
Chairman: Department of Physics, University of Notre Dame, 1982-1985
Chairperson: Division of Atomic, Molecular, and Optical Physics, American Physical Society, 1988-1989.
Alexander von Humboldt Senior U.S. Scientist Award, University of Frankfurt, 1982-1983;
Technical University of Dresden1994; Technical University of Dresden 2001.
Gordon Godfrey Fellow, University of New South Wales, Sydney, 2000, 2005