John Wilkes Booth was the son of prominent, wealthy actors. He, too, became an actor and was so popular, he was one of the first to have his clothes ripped off by fans. Hulton Archive/Getty hide caption
Psychology is the systematic investigation of the human mind, including behavior and cognition. It thus encompasses both normal and abnormal behavior. On the other hand, psychiatry is a branch of medicine dealing with mental illness.
While psychiatrists and psychologists are similar in many ways, there are also some important differences of which you should be aware. First, psychiatrists have a medical degree and psychologists have a doctorate-level degree in psychology.