Research Associate, Laboratory of Atomic and Solid State Physics and Department
of Physics, Cornell University, 1962-63
Instructor, Department of Physics, Cornell University, 1963-1964
Assistant Professor of Physics, Cornell University, 1964-1967
Associate Professor of Physics, Cornell University, 1967-1971
Professor of Physics, Cornell University, 1971-1991
E. L. Nichols Professor of Physics, 1991-present
Director of the Laboratory of Atomic and Solid Physics, 1994-1995, 1997-2006
Stanford University, 1970
University of California, Irvine, 1971
University of Canterbury, New Zealand, 1976
Los Alamos National Laboratory, 1977
IBM Research Laboratory, San Jose, 1981
Science University of Tokyo, 1984
Max Planck Institute, Stuttgart, Germany, 1985
Science University of Tokyo, 1991
Seoul National University, 1992
University of Canterbury, New Zealand, 1993
Tohoku University, Japan, 1998
Arizona State University, Tempe, 2003
Member, American Physical Society
Member, Optical Society of America
Member, DARPA Materials Research Council, 1969-1975
Member, Review of Scientific Instruments, Editorial Board, 1976-1979
Member, National Materials Advisory Board Committee on the Mechanical Properties
of Infrared Transmitting Materials, 1976-1978
Member, Solar Energy Materials, Editorial Board, 1979-present
Member, Technical Council of the Optical Society, 1981
Consultant, Los Alamos National Laboratory, 1978-1982
Consultant, General Motors Research Laboratory, 1978-1985
Feature Editor on High Temperature Superconductivity, Journal of the Optical
Society of America B, March 1989
American Physical Society, Division of Condensed Matter Physics Executive Committee,
1988-91
APS Buckley Prize Committee Chairman, 1993
Lecturer, NATO Advance Study Institute, Erice, Italy, 1995
US-Japan NSF Far Infrared Workshop Chairman, 1995
Brookhaven NSLS Science Advisory Committee, 1996-present
Ames Laboratory Program Review Committee, 1996-present
CECAM Workshop on Nonlinear Localized Excitations in Condensed Matter and Molecular
Physics, Co-Chairman, Lyon, France, 1998
Space Infrared Telescope Facility Advisory Committee Chairman, 1999-2001
Director, NATO ARW on "Intrinsic Localized Modes and Discrete Breathers in Nonlinear
Lattices," Erice, Sicily, 2003
Chairman, American Physical Society Frank Isakson Optics Prize Committee, 2003