Skip to main content
John Preston III, MD, Psychiatry, Jamul, CA

JohnCharlesPrestonIIIMD

Psychiatry Jamul, CA

Staff Psychiatrist in CDCR

Dr. Preston is on Doximity

As a Doximity member you'll join over two million verified healthcare professionals in a private, secure network.

  • Gain access to free telehealth tools, such as our “call shielding” and one-way patient texting.
  • Connect with colleagues in the same hospital or clinic.
  • Read the latest clinical news, personalized to your specialty.

See Dr. Preston's full profile

Already have an account?

  • Office

    PO BOX 932
    Jamul, CA 91935
    Phone+1 619-995-2533
    Fax+1 619-222-2222

Education & Training

  • University of California (San Francisco)/Fresno
    University of California (San Francisco)/FresnoResidency, Psychiatry, 1991
  • University of California (San Francisco)/Fresno
    University of California (San Francisco)/FresnoInternship, Internal Medicine, 1987 - 1988
  • Ponce Health Sciences University School of Medicine
    Ponce Health Sciences University School of MedicineClass of 1987

Certifications & Licensure

  • CA State Medical License
    CA State Medical License 1988 - 2026
  • American Board of Psychiatry and Neurology Psychiatry