Bachelor of Science, American University Beirut. Doctor of Medicine, Meharry Medical College, 1979.
Professor pediatrics neurology and geriatrics Baylor College Medicine, Houston, since 1994. Investigator Howard Hughes Medical Institute, since 1996. Pediatrician Texas Children's Hospital and Ben Taub General Hospital.
Elected member Institute of Medicine, 2000. Science advisory board International Rett Syndrome Association. Medical research advisory board National Ataxia Foundation.
Science issues committee American Academy Neurology.
Member of American Academy Neurology (science issues committee), Institute Medicine, National Academy of Sciences.