In the movie Trading Places, a millionaire bets his brother that he can turn a beggar and thief into an upstanding citizen and turn a wealthy, moral man into a common criminal, just by altering the circumstances and environment of the two men. This view reflects the ideas of:

The answer is John Watson

Explanation:

John Watson was a famous American Psychologist, he is know as the father of behaviorism (Behavioral psychology). He conducted research on animal behavior, child development and advertising. He is known for his controversial "Little Albert" experiment and kerplunk experiment. He made popular the use of scientific theory with behaviorism. Behaviorism is a theory of learning which is based on the idea that all behaviors are acquired through conditioning, conditioning occurs through interaction with the environment.

Watson strongly believed that environment is a factor that shapes a person's behavior over their genetic make up or natural temperament. A person's responses to environmental stimuli shape their actions and to change certain actions or behaviors one has to arrange circumstances to re-enforce the required actions and avoid circumstances that oppose them.