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.
Educational track: Psychiatrists are medical doctors who after completing their graduate courses specialize in the field of psychiatry. Being physicians they are licensed to precribe medications. Psychologists on the other hand studied normal psychology and psychological disorders in a non medical domain.