James Mark Baldwin , evolutionist inspired by Charles Darwin, Baldwin developed a biosocial theory. Baldwin was the first Psychologist to use children, his own daughters in scientific observation. Baldwin’s theories pioneered contemporary psychology. Major is his theory on behavioral adaptation to knowledge development. What we understand today as the biopsychosocial theory of intellectual evolution and behavior stems from his theories of natural heredity through genetics and social heredity through environment and culture. His advents to modern psychology today are documented in his post 19th century works. Baldwin proposed individual adaptation conceptualizing imitation adherent to what he called ideomotor suggestion-a repetitive involuntary