Contract psychologists are independent contractors who provide a variety of mental health services for companies on a short- or long-term contract basis. You can work as a clinical psychologist where you assess, diagnose, and provide treatment for mental health and behavior disorders. Counseling psychologists offer private therapy sessions to determine and address a patient's ongoing mental health problems. Developmental psychologists study the psychological progress of patients in a specific age group. Other options include school psychologists, research psychologists, forensic psychologists, and social psychologists. A contract psychologist may work for a fixed period or provide ongoing services as necessary and may have multiple employers at the same time.