Psychologists study the human mind. Their research helps us understand behavior, memory and mental health disorders. Through counseling and experimentation, psychologists work to promote safety, understanding and good mental health. They can be found in practically any work environment, including hospitals, schools or corporations. Psychology professions require at least a master's degree, and most require a doctorate. During their training, psychologists choose an area of specialization. Psychologists must also be licensed or certified at the state or national level.