Jerold J. Kreisman, MD, is a psychiatrist and leading expert on borderline personality disorder (BPD). He is coauthor of the best seller I Hate You, Don?t Leave Me; which is considered a classic of both the popular and academic literature on BPD, and has been completely revised and updated in 2010. His book Sometimes I Act Crazy describes how families and friends confront the disorder. Kreisman produces a blog for Psychology Today. He lectures widely in the United States and abroad, and is in private practice in St. Louis, MO.