Question: who is the most important person in psychology?
Answer: B. F. Skinner. ... 
Jean Piaget. Jean Piaget's theory of cognitive development had a profound influence on psychology, especially the understanding of children's intellectual growth. ... 
Sigmund Freud. ... 
Albert Bandura. ... 
Leon Festinger. ... 
William James. ... 
Ivan Pavlov. ... 
Carl Rogers.