William F. Pettit Jr., M.D., is co-owner with his wife, Dr. Linda Pettit of 3 Principles Intervention LLC. Dr. Pettit has presented the Three Universal Principles of Mind, Consciousness and Thought as the essence of his psychiatric practice since 1983. Since June, 2017 Dr. Pettit have lived in Phoenix Arizona. Dr. Pettit retired from clinical psychiatry in December of 2018 but has in 2023 once again obtained his medical license to practice medicine in Arizona. He is active serving as adjunct faculty at Creighton University School of Medicine . He is a Psycho-Spiritual Mento/Coach to individuals, groups and organizations, nationally and internationally. Moved by what he has witnessed since meeting Sydney Banks In 1983, Dr. Pettit is presenting online courses sharing what he has seen. In addition he is in process of creating a Psycho-Spiritual Academy based on the 3 Universal Principles of Mind, Consciousness, Thought as shared by Sydney Banks. As a graduate of Creighton University, Omaha, NE and the University of Illinois College of Medicine, Chicago, IL, Dr. Pettit completed his psychiatric residency at the Philadelphia Naval Regional Medical Center in Philadelphia, PA and Portsmouth Naval Regional Medical Center in Portsmouth VA. He is board-certified in Psychiatry, and has been previously certified in Adolescent Psychiatry, Geriatric Psychiatry and Psychosomatic Medicine and Addiction Medicine. Dr. Pettit served as a physician in the United States Navy for over 9 years, including 3 years as a Navy Flight Surgeon and 3 years as Chief of Psychiatry of the Navy Nuclear Submarine base at Groton, Connecticut.

In addition to his present appointment as Adjunct Clinical Professor at Creighton University School of Medicine, Department of Psychiatry where he presently serves on the Phoenix Arizona campus. He also has served as Adjunct Clinical Professor at Michigan State University School of Osteopathic Medicine, Department of Psychiatry. Dr. Pettit was a consultant to West Virginia University School of Medicine from 1998 until he became a full-time faculty member 2002 to 2010 While there, he achieved appointment as Associate Professor of Behavioral Medicine and Psychiatry and was the Medical Director of the Sydney Banks Institute. During his time at WVU, Dr. Pettit was the lead author on a book chapter “ Adverse Cardiovascular Effects of Centrally-Acting Psychiatric Medications”, Cardiovascular Toxicology, 4 th Edition, published 2008 by Taylor and Francis, London and New York. Pettit, W.F., Mishra, M.D., Finkel, M.S., (2008) In addition, Dr. Pettit had previously held an appointment as Adjunct Assistant Professor at the Des Moines, Iowa Osteopathic School of Medicine and taught as an Adjunct Professor at Sienna Heights University. Dr. Pettit is a recognized educator in the Three Principles Understanding, and has presented at many national and international conferences and consulted to numerous clients and organizations both nationally and internationally. He has co-authored a paper Only One Generic Mental Illness: A Psycho-Spiritual Explanation of General Factor p and Its Application to Spiritually- Informed Clinical Practice which was published by Spiritual Psychology and Counseling in June 2021.

Dr. Pettit, has thus far created five online Courses under the series title of One Cause: One Cure: Course #1 Exploring the Mind brain body behavior Connection – Understanding Universal Principles Changes Everything.
Course #2 Defining, Recognizing, and Awakening Mental Health and Well Being:
Seeing Universal Principles Brings Fresh Hope.
Course #3 Hope for the Helpers: Less Stress, More Joy
Course #4 Thriving Together
Course #5 The Missing Link for Veterans (available on YouTube at no cost)
Course #6 Never Broken:Nothing Lacking, One Cause: One Cure, Fresh Hope ( a 6 month- 24 hour course