1. Associate Professor of Anesthesia, Department of Anesthesia, Brigham and Women's Hospital.
2. Senior Research Scientist, Centro de Biofisica y Bioquimica, Instituto Venezolano Investigaciones Cientificas.
3. Research Scientist, Department of Anesthesia, Brigham and Women's Hospital.
4. Associate Professor of Anesthesia, Department of Anesthesia, Massachusetts General Hospital.
5. Senior Scientist, Department of Muscle Research, Boston Biomedical Research Institute.