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 both psychiatrists and psychologists are mental health professionals, the big difference is that psychiatrists are medical physicians (M.D. or D.O.) while psychologists are not. Because they are licensed physicians, psychiatrists can prescribe drugs.hile both psychiatrists and psychologists are mental health professionals, the big difference is that psychiatrists are medical physicians (M.D. or D.O.) while psychologists are not. Because they are licensed physicians, psychiatrists can prescribe drugs.