What type of psychologist studies, diagnoses, and treats people who experience emotional, behavioral, and psychological problems or disorders?

Clinical psychologist

Explanation:

A clinical psychologist employs the knowledge of clinical psychology which involves the scientific study, assessment and treatment of mental disorders and psychiatric problems. A clinical psychologist uses the knowledge of science, theory and clinical knowledge in treating or ameliorating psychologically based problems of people. A clinical psychologist is trained to use different approaches in helping people with psychologically based problems, by observation and use of interview and tests to diagnose disorders. They may consult with other health professionals in determining the appropriate treatment which might include medication for the client. Hospitals and mental health clinics usually employ the services of clinical psychologists.

yes, it is pretty much the same thing, which is cool. : )