physician who specializes in psychiatry
A psychiatrist is a medical doctor who specializes in psychiatry. They treat people with mental illness. Psychiatrists can prescribe psychiatric medication.
In the United States, psychiatrists train by going to university first, then medical school for 4 years. After medical school, they must complete a residency. When they graduate, they get to use the initials M.D. or D.O. after their names. Next, these doctors specialize by training for 3 or 4 years in Psychiatry. In other countries psychiatrists train in similar ways but may not have to go to a separate university and medical school.