David N. Daniels, M.D. (August 30, 1934 to May 29, 2017) was a world-renowned Enneagram author, teacher, and thought leader, co-founder of The Narrative Enneagram and the International Enneagram Association, and Clinical Professor of Psychiatry and Behavioral Sciences at the Stanford University School of Medicine. As one of the founding fathers of today’s Enneagram, David N. Daniels, M.D. brought credence, rigor, and scientific validity to the Enneagram. In 1994, he led efforts to host and sponsor the first International Enneagram Association conference at Stanford University. In 2000, he released a Stanford University based scientifically validated Enneagram test, which still remains the only scientifically validated test today. David N. Daniels is the lead-author of the Enneagram bestseller, The Essential Enneagram (Harper Collins) updated and revised with vital new material in 2009, lead-author of The Enneagram, Relationships and Intimacy published in 2018 with co-author Suzanne Dion, and co-author with Daniel J. Siegel, M.D. of the upcoming book, Nine Paths to Wholeness to be released in 2021 by Norton. He also co-developed the outstanding DVD, The Enneagram: Nine Paths to a Productive and Fulfilling Life and The Enneagram in the Workplace. In private practice for over 40 years, David also taught the Enneagram system at Stanford University, in the community, and internationally on every continent for 30 years. David brought his knowledge of the Enneagram to individuals, couples and groups, and to a wide range of applications in clinical practice and the workplace. He has developed many innovative workshops, including The Dynamics of Vital Relationships, Anger and Forgiveness, Loss and Grief as Transformers, the Enneagram’s Gift to Love and Life, Intimate Relationships, Love and Will, and The Enneagram’s Gift to Mastering Conflict Constructively and Compassionately. His work is being carried on at www.drdaviddaniels.com.

Virginia Price, Ph.D., (1942-2005) was a psychologist with a private practice in Palo Alto. She wrote Type A Behavior Pattern, a book widely regarded as a landmark in its field.