The older adult population is booming in the United State and across the globe. With this boom comes an increase in the number of older adults who experience psychological disorders. Current estimates suggest that about 20% of older persons are diagnosable with a mental disorder: Personality disorders are among the most poorly understood, challenging, and frustrating of these disorders among older adults. This book is designed to provide scholarly and scientifically-based guidance about the diagnosis, assessment, and treatment of personality disorders to health professionals, mental health professionals, and senior service professionals who encounter personality-disordered or "difficult" older adults.