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Dr. O'Brien is on Doximity

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Education & Training

  • University of California (Irvine)
    University of California (Irvine)Residency, Internal Medicine, 1992 - 1995
  • New York Medical College
    New York Medical CollegeClass of 1992

Certifications & Licensure

  • CA State Medical License
    CA State Medical License 1994 - 2025
  • American Board of Internal Medicine Internal Medicine

Press Mentions

  • Delay Antibiotics for Sepsis Patients? No Thanks, Say Some Docs
    Delay Antibiotics for Sepsis Patients? No Thanks, Say Some DocsOctober 27th, 2018

Hospital Affiliations