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Adhia & Associates

Pia Quimson-Gueverra Forensic Psychiatrist

Pia Quimson-Guevarra, DO

Physician, Board-Certified

Forensic Psychiatry
Psychiatry

American Board of Psychiatry and Neurology

Licensed Psychiatrist, Portland, OR

Download Dr. Quimson-Guevarra's Complete CV

Medical-Legal

Consultant and Disclosed Expert Witness

Damages: Psychiatric Symptoms and Diagnosis
Civil and Criminal Matters
Employment / Occupational Evals.
Objective Opinions | Plaintiff & Defense

Dr. Quimson-Guevarra

Dr. Quimson-Guevarra is a Board-Certified Adult and Forensic Psychiatrist (ABPN) in private clinical practice since 2016, and forensic practice since 2019, conducting IMEs, and issuing her findings by report and testimony. She is based in the Pacific Northwest (Portland, OR) and holds medical licenses in Oregon and Washington. She is available for medical-legal cases nationwide.

In forensic practice, Dr. Quimson-Guevarra serves as an expert witness and consults to attorneys, courts and employers, in civil litigation (plaintiff and defense,) criminal defense, prosecution, workers’ compensation and administrative hearings.

She has testified in U.S. District Court (appeal), Oregon Circuit Courts, Washington Circuit Court, workers’ compensation administrative matters, and the Oregon Psychiatric Security Review Board (PSRB.) She has worked with Oregon Courts, and the Forensic Assertive Community Treatment Team (FACT) providing treatment with criminal justice factors to individuals with severe and persistent mental illness, substance abuse and underserved communities.

Dr. Quimson-Guevarra prides herself on her objectivity and ability to render an unbiased opinion.

Dr. Quimson-Guevarra has an active clinical practice as founder and Medical Director of Quimson Behavioral Health, a mental health practice in Portland, Oregon where she treats patients, and supervises mental healthcare.

Licensure, Credentials, Qualifications and Experience

Oregon Medical License #DO179697
Washington Medical License #DO.OP.70057325

Board Certifications

Psychiatry, American Board of Psychiatry and Neurology, (Certificate #73318) (2017-Active)

Forensic Psychiatry, American Board of Psychiatry and Neurology, (Certificate #2495) (2019-Active)

Vetting Resource: Verify Board-Certification at Physician Verification, American Board of Psychiatry and Neurology

Professional Experience

Adhia & Associates, Forensic Psychiatrists

Expert Witness and Legal Consultant to Attorneys in a group Forensic Psychiatry practice.

Dr. Quimson-Guevarra is an Associate with Psychiatry and Brain Injury Medicine specialist Sanjay Adhia, M.D. P.A. and Child & Adolescent Psychiatrist Kerry Mendes, M.D. Private practice. Houston, TX, California, Oregon, and nationally. (2025-present)

Forensic psychiatry
Adult psychiatric forensic evaluation
Record reviews, medical and legal
Independent medical examination (IME) assessment
Civil litigation
Criminal defense and prosecution
Workers’ Compensation and occupational assessments
Reports of findings and conclusions
Testimony

Quimson Behavioral Health

Founder, Medical Director and Psychiatrist, treating patients and supervising mental health care. Portland, OR (2019-Active)

Psychiatric outpatient care, assessment and treatment of adult patients
Treatment of mental health conditions, including trauma, anxiety, depression, PTSD, ADHD, schizophrenia, and bipolar disorder.
Supervising Quimson Behavioral Health mental healthcare provider.

Prior Clinical Experience

Cascadia Behavioral Health (2017-2021)

Outpatient psychiatric care to patients in the Forensic Assertive Community Treatment (FACT) program
Outpatient psychiatric care: urgent walk-in clinic

Columbia Care, Outpatient Mental Health Care. Psychiatrist. (2017-2018)

Portland Veteran’s Administration, inpatient general psychiatry (See residencies)

Prior Forensic Psychiatric Services

Offices of the Public Defender of Washington, Multnomah, Clackamas, and Deschutes Counties, Oregon

Education

Forensic Psychiatry Fellowship, Oregon Health & Science University, Portland, OR (2018-2019)

Emphasis: Law and the Legal Process, Criminal Forensic Psychiatry, Civil Forensic Psychiatry, Special Issues in Forensic Psychiatry, Landmark Cases

Washington County Jail, Multnomah County Detention Center, and Oregon Department of Corrections, telepsychiatry and forensic psychiatry
Washington County Mental Health Court Consultation
Willamette University Law School (see also, Presentations)
Oregon State Hospital Forensic Evaluations

Oregon Health & Science University, General Psychiatry Residency. Portland, OR (2013-2017)

Doctor of Medicine, Doctor of Osteopathic Medicine, DO, Western University of Health Sciences. Pomona, CA (2009-2013)

Bachelor of Science Degree in Nutritional Sciences, Emphasis on Physiology and Metabolism. University of California, Berkeley. Berkeley, CA (2002-2006)

Publications

Quimson-Guevarra P, Mobbs K. Need for Representation in a Pro Se Case. Journal of the American Academy of Psychiatry and the Law, September 2019 47(3), 385-387.

Quimson-Guevarra, Pia, Jones TG. Post-Atkins Determination of Intellectual Disability in a Death Penalty Case in Oregon. Journal of the American Academy of Psychiatry and the Law, September 2016 44(3), 394–396.

Presentations

Workers’ Compensation, didactic presentation for OHSU Forensic Psychiatry fellows (2/28/25)
Workers’ Compensation, didactic presentation for OHSU forensic psychiatry fellows (5/31/2024)
Mood Disorders, webinar presentation to a private clinical practice. Portland, Oregon (11/2022)
Career Panel for Forensic and Criminal Psychology Symposium, Lewis and Clark College (2/2019)
Testamentary Capacity, Willamette University College of Law (10/2018)
Psychopharmacology, didactic presentations for 1st year OHSU psychiatry residents (2016-2017)

Treatment of Bipolar Disorders
Treatment of Anxiety Disorders
Psychiatric Drug-Drug Interactions
Journal Club presentation for OHSU adult psychiatry training program (8/2016)
Applebaum PS. Assessment of Patients’ Competence to Consent to Treatment. New England Journal of Medicine 2007; 357:1834-40.

Common Factors in Psychotherapy, Presentation to 2nd year OHSU Psychiatry Residents (7/2016)
Global Mental Health, “Expert Hour” to OHSU Adult Psychiatry training program (4/2016)
Evaluation of Consult and Liaison Service rotations for OHSU adult psychiatry training program, Education Performance Committee (EPC) (8/2015)
Animal-Assisted Therapy, 14th Course of Academic Development of Psychiatry (CADP) (3/2015)
Mortality and Morbidity (M&M) Conference for OHSU Adult Psychiatry training program (4/2014).

Media

“More Asian Americans, Pacific Islanders Seeking Mental Health Services,” KGW8, NBC Portland, OR Affiliate. May 18, 2021

Professional Affiliations

American Academy of Psychiatry and the Law, Member and Contributor to Journal of the American Academy of Psychiatry and the Law (see Publications above)
Oregon Psychiatric Physicians Association
American Psychiatric Association
National Society of Collegiate Scholars (NSCS)