A psychiatrist and award-winning documentarian sheds light on the mental-health-care crisis in the United States. When Dr. Kenneth Rosenberg trained as a psychiatrist in the late 1980s, the state mental hospitals, which had reached peak occupancy in the 1950s, were being closed at an alarming rate, with many patients having nowhere to go. There has never been a more important time for this conversation, as one in five adults--40 million...