As Dr. Stembridge conducts research on how children's moral reasoning changes as they grow older, it is most likely that he is a developmental psychologist.
Basically, a developmental psychologists are the people that study human growth and development over the lifespan including their physical, cognitive, social, intellectual, perceptual, personality and emotional growth.
They often utilize a number of theories to think about different aspects of human development. For example, the Piaget's theory of cognitive development that outlined the key stages that children go through as they learn.
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