Waguih William IsHak, MD, FAPA, is a professor and clinical chief of psychiatry at Cedars-Sinai and clinical professor of psychiatry at the David Geffen School of Medicine at UCLA. Dr. IsHak has more than 35 years of experience in psychiatry, psychotherapy, and psychopharmacology, with specific expertise in outcome measurement in psychiatric disorders particularly depressive symptom severity, functioning, and quality of life. He is researching innovative ways to measure and improve the detection and treatment of depression in people seeking medical care, to restore/maintain health in the population at large to remove behavioral barriers to wellness.

He has edited and authored five books: The Handbook of Wellness Medicine (Cambridge University Press, 2020), Textbook of Clinical Sexual Medicine (Springer-Nature, 2017), Guidebook of Sexual Medicine (A&W Publishing, 2008), Outcome Measurement in Psychiatry: A Critical Review (APPI, 2002) and On Call Psychiatry (WB Saunders, 2001). He is the editor of the upcoming Atlas of Psychiatry (Springer-Nature, 2023).

Dr. IsHak served as a Chief Proctor and Examiner for the American Board of Psychiatry and Neurology, and he is a Distinguished Life Fellow of the American Psychiatric Association.