| 2008 – present |
Chair, Department of Ophthalmology, University of CA, Irvine |
| 2008 – present |
Director, The Gavin Herbert Eye Institute |
| 2005 – present |
Professor of Biomedical Engineering, University of CA, Irvine |
| 2004 – present |
Professor of Ophthalmology, University of California, Irvine |
| 2004 – 2008 |
Vice Chair of Clinical Ophthalmology, University of CA, Irvine |
| 2001 – 2004 |
Associate Clinical Professor, Harvard Medical School |
| 1987 – 2001 |
Assistant Clinical Professor in Ophthalmology
Harvard Medical School |
| 1984 – 1986 |
Clinical Instructor in Ophthalmology, Harvard Medical School |
| 1983 – 1985 |
Visiting Scientist, George R. Harrison Spectroscopy Lab, Massachusetts Institute of Technology |
| 1981 – 1984 |
Clinical Assistant in Ophthalmology
Harvard Medical School |