Professor Pmeritus, in the Department of Physics and Astronomy, University of California, Los Angeles
7/2021 to present: Distinguished Research Professor, Dept. of Physics & Astronomy, UCLA
7/1985 to 6/2021: Professor, Dept. of Astronomy and Dept. of Physics & Astronomy, UCLA
9/1998 to 1/1999: CNRS Chercheur Associé, Institut d’Astrophysique de Paris
7/1996 to 8/1996: Professeur Associé, Univ. Paris 6 (Institut d'Astrophysique, Paris)
11/1994 to 6/1995 and 10/06 to 6/10: Vice-Chair, Division of Astronomy & Astrophysics, Dept. of Physics and Astronomy, UCLA
7/1992 to 10/1994: Chairman, Department of Astronomy, UCLA
7-8/1992, 7/1993: Visiting Scientist, Service D'Astrophysique, CEA Saclay, France
9/1990 to 7/1991: Chaire Municipale, Université Joseph Fourier, Grenoble, France
7/1983 to 6/1985: Associate Professor, Department of Astronomy, UCLA
1/1983 to 6/1983: Adjunct Associate Professor, Department of Astronomy, UCLA
5/1982 to 7/1982: Visiting Research Associate, Department of Astronomy, UCLA
9/1981 to 1/1982, 7/1984, and 7/1993: Professeur Associé, Groupe d'Astrophysique, Université Joseph Fourier
6/1980 to 7/1980: Visiting Scientist, Observatoire de Paris, Meudon, France
7/1977 to 12/1982: Assistant Professor, Dept. of Astronomy, Columbia University
10/1974 to 6/1977: Postdoctoral Research Fellow, Owens Valley Radio Observatory, Caltech
7/1971 to 9/1974: NDEA Fellow, Physics Department, University of Chicago
9/1969 to 6/1971: Teaching Assistant, Physics Department, University of Chicago
6/1969 to 9/1969: Summer Research Student, Lawrence Radiation Lab