Lecturer in Medicine,
Harvard Medical School,
University of Harvard

Director and Professor,
High Energy Theory Group,
Department of Physics,
University of Harvard

The Wellcome Trust Center for Human Genetics,
Nuffield Department of Clinical Medicine,
University of Oxford

 Professor of Surgery
 Director of Willis Knighton/LSUHSC Regional Transplant Program,
 Director of Living Related Liver Transplant Center,
 Louisiana State University