TheDrsPettit.com: Dr. William F. Pettit Jr. is one of the earliest teachers of the Principles who brought this understanding into his practice of psychiatry exclusively shortly after meeting Sydney Banks in the early 1980s. Dr. Pettit offers unique insights into the mind-body-spirit connection and the way the Principles inform current Neuroscientific research. His wife, Linda Sandel Pettit, EdD, is a psychologist who is a powerful teacher and mentor in the Principles. They offer many programs, both on-line and individually.