A psychologist is a professional who applies the science of human behavior to the resolution of problems.
Psychologists have a doctoral degree which involves four or more years of graduate training beyond the bachelor's degree, as well as an internship in a clinical setting, and additional training as a psychology resident.
To be licensed, psychologists must provide evidence of appropriate education, training and experience.
Candidates for licensure are then required to pass a nationally standardized written examination as well as a specialized examination for each state in which they practice psychology.
Psychologists are different from counselors and social works because they have more extensive training and experience in all aspects of mental health.