A licensed psychologist is a professional who holds a license to practice psychology, which typically requires completing an advanced degree in psychology and passing a state-administered examination. Psychologists are trained to assess, diagnose, treat, and prevent mental disorders through various therapeutic techniques such as counseling, cognitive therapy, behavior therapy, and psychoanalysis. They may work with individuals, families or groups, and their practice often involves addressing issues related to mental health, relationships, substance abuse, and stress management. A licensed psychologist must adhere to a strict code of ethics and maintain ongoing education requirements to continue practicing in their field.