Dr. Greg Maddex attended Michigan State University in East Lansing, MI earning his B.A. -1972. In 1978 Dr. Greg Maddex earned his Doctor of Osteopathy degree from Michigan State University completing his rotating internship at Fifth Avenue Medical Center (formerly Waldo General Hospital) in Seattle, Washington.

He has been in private practice since Vashon, Washington and now in Diamond Bar, CA. He is the past president of the San Bernardino County Osteopathic Association, and past national president of the American Osteopathic Academy of Addiction Medicine. He regularly supervises extern rotations for various osteopathic medical schools. His practice has included such holistic measures as natural hormone replacement, vitamin supplementation including intravenous vitamins such as " John Mayer Cocktails " in appropriate patients for the last 30 years.