Psychiatrists can prescribe medication, perform psychiatric assessments and provide psychotherapy when needed. Psychologists can teach, do research, or work in a practice or other clinical setting. Depending on their training, some psychologists can complete psychological testing. They also provide therapy either one-on-one or in a group setting. Usually a therapist is a Licensed Clinical Social Worker (LCSW) or a Licensed Clinical Mental Health Counselor (LCMHC). A licensed therapist completed graduate school, training and is licensed by their state board.