Waguih William IsHak, MD, FAPAProfessor and Clinical Chief of PsychiatryCedars-Sinai Department of Psychiatry and Behavioral NeurosciencesClinical Professor of Psychiatry, David Geffen School of Medicine at UCLALos Angeles, California USAWaguih William IsHak, MD, FAPA has nearly 30 years of experience in psychiatry, psychotherapy, and psychopharmacology, with specific training and expertise in sexual medicine, 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, as a way to restore/maintain health in the population at large in order to remove behavioral barriers to wellness. Dr. IsHak has lectured and published on quality of life as a critical outcome measure of healthcare interventions, mood disorders especiallydepression, sexual medicine, outcome measurement in psychiatry, and computer applications in psychiatry. He was also the author and designer of Health Education Programs for the Public, including the Online Depression Screening Test (ODST), Online Screening for Anxiety (OSA) and Online Screening Tests for Sexual Disorders. He has edited and authored five books: this volume, the Guidebook of Sexual Medicine (A&W Publishing, 2008), Outcome Measurement in Psychiatry: A Critical Review (APPI, 2002) and On Call Psychiatry (WB Saunders, 2001), and The Textbook of Clinical Sexual Medicine (Springer Science+Business Media, 2017) . His articles have appeared in many prestigious journals, such as JAMA Psychiatry, Journal of Clinical Psychiatry, Harvard Review of Psychiatry, Journal of Affective Disorders, Journal of Sexual Medicine, Journal of Graduate Medical Education, and Quality of Life Research. He is a member of several professional societies, including the American Psychiatric Association, American Association of Directors of Psychiatry Residency Training, and the Society for Brain Mapping and Therapeutics. Dr. IsHak was awarded the 2002 and 2010 Golden Apple Teaching Award, Department of Psychiatry, Cedars-Sinai Medical Center, 2007 Outstanding Medical Student Teaching Award, Department of Psychiatry and Biobehavioral Science at UCLA, 2011 Excellence in Education Award, David Geffen School of Medicine at UCLA, 2012 Parker J. Palmer Courage to Teach Award, Accreditation Council for Graduate Medical Education, 2012 Nancy Roeske Award for Excellence in Medical Student Education, American Psychiatric Association, and was elected to the Gold Humanism Honor Society in 2012. Dr. IsHak served as a Chief Proctor and Examiner for the American Board of Psychiatry and Neurology, Clinical Professor of Psychiatry at the David Geffen School of Medicine at UCLA Department of Psychiatry and Biobehavioral Sciences, and Distinguished Fellow of the American Psychiatric Association.