Dr. Mason believes that depression and mania are caused by the death of a love object. Some people introject the loss and become depressed, whereas other people deny the loss and become manic. Dr. Mason is MOST likely a theorist.

Psychodynamic

Explanation:

Psychodynamics, also known as psychodynamic psychology, in its widespread sense, is a way of approach to psychology that focuses systematic examination of the psychological forces that underlie human feelings, emotions, and behavior and how they might relate to early experience. It is especially interested in the dynamic relations between conscious motivation and unconscious motivation.