About Dr. Marcus Williams

Dr. Marcus Williams is a board-certified psychiatrist and addiction medicine specialist with 20 years of clinical experience. He trained at Johns Hopkins School of Medicine and completed his addiction psychiatry fellowship at Yale.

As Medical Advisor to BehavioralHealthGuide.org, Dr. Williams oversees clinical accuracy for all substance use disorder, addiction, and psychiatric medication content. His research focuses on expanding access to medication-assisted treatment (MAT) in underserved communities.

Areas of expertise

• Addiction Psychiatry
• MAT
• Opioid Use Disorder
• Alcohol Use Disorder
• Dual Diagnosis

Editorial role at BehavioralHealthGuide.org

BehavioralHealthGuide.org is committed to providing clinically accurate, evidence-based information to help patients and families find the right behavioral health care. All clinical content is reviewed by licensed practitioners with relevant specialty expertise before publication.

Our editorial process involves licensed clinicians reviewing content for accuracy, currency with clinical guidelines, and appropriateness for a patient-facing audience. Reviewers check that treatment recommendations reflect current evidence-based standards and that content does not overstate claims or mislead readers about clinical outcomes.