| Professor of Genetics, Center for Cancer Biology and Dept. of Genetics, Univ. of Rochester, New York | 0 |
| Co-Director, W.M. Keck Center for Tissue Engineering, University of Utah | 2000 |
| Professor of Oncology; Chief, Division of Cell Biology; Head, Brain Tumor Program; Investigator; Huntsman Cancer Institute, Department of Oncological Sciences, University of Utah Health Sciences Center, Salt Lake City, Utah | 2000 |
| Member, Ludwig Institute for Cancer Research | 1995 |
| Professor of Cellular and Developmental Biology, Departments of Biochemistry & Molecular Biology and Anatomy & Developmental Biology, University College London . | 1995 |
| Head, Cellular Neurobiology, Ludwig Institute for Cancer Research, Courtauld Building, 91 Riding Street, London, W1P 8BT. | 1995 |
| Senior Research Fellow and Honorary Lecturer, Department of Clinical Neurology, Queen Square, London | 1987 |
| Research Assistant, Department of Clinical Neurology, Institute of Neurology, Queen Square, London | 1983 |
| MRC Neuroimmunology Project, Department of Zoology, University College London, London, UK | 1981 |
| Honorary Research Assistant, MRC Neuroimmunology Project, Department of Zoology, University College London | 1981 |
