Who is Dr. Leon Stone from Valis and what is their importance?

Dr. Leon Stone is one of the most important people in Horselover Fat's life. He is the psychiatrist in charge of the North Ward at the Orange County Mental Hospital, while Fat is under evaluation following his suicide attempt. Stone believes that Fat's act represents a breakthrough reaching out toward reality. He offers Fat homeopathic Bach remedies to assist him with his sense of helplessness and fear, as well as his inability to act. Fat sees Stone as being crazy in a good way, and he appreciates the way Stone talks to him like a human being. Stone lends him a copy of Lao Tzu's Tao Te Ching to work on anger issues.