Over the course of more than two decades and five previous editions, The American Psychiatric Association Publishing Textbook of Geriatric Psychiatry has established itself as a foundational resource in the field. This new edition retains the multidisciplinary and developmental perspectives of its predecessors, drawing on the knowledge not only of psychiatrists but also of relevant biomedical and behavioral experts in order to present the most comprehensive approach to patient care. It has been extensively updated to reflect the latest scientific advances and clinical developments in the field. Not only will readers find the most up-to-date information on phenomenology, diagnosis, and assessment of late-life mental disorders, they will also access the latest research on psychotherapeutic, psychopharmacological, and other somatic treatments. A dedicated chapter delves into the role of technology—including digital phenotyping, wearables, digital and Web-based neurocognitive testing, and more—in aiding the geriatric mental health workforce and improving both access to care and ongoing support. Throughout the book, several sections also candidly examine the impact of COVID-19, and its attendant social isolation, on older adult mental health and the evolution of treatment approaches, revealing insights learned about telepsychiatry and care in nursing homes during the pandemic. Chapters on the legal and ethical factors in the psychiatric care of older adults close out the book, the most exhaustive on the topic. Extensively researched and with key points for ease of reference, this edition will equip both the scholar and the clinician with the current state of scientific understanding as well as the practical skills and knowledge base required for dealing with mental disorders in late life.