Dr. heinlein studies how people grow and change during late adolescence and young adulthood. dr. bradbury focuses on several traits that distinguish one person from another. dr. heinlein is a(n) psychologist; dr. bradbury is a

The correct answers are developmental psychologist; personality psychologist.

Answer 1: Dr. Heinlein seems to be a developmental psychologist. Developmental psychologists refer to psychologists who specialize in the psychological and behavioral growth of individuals across their lifespan, from infancy to late adulthood. Specifically, developmental psychologists investigate the cognitive, behavioral, social, emotional and psychological changes and growth people experience through their lifespan. 

Answer 2: Dr. Bradbury seems to be a personality psychologist. Personality psychologists are psychologists who have specialized knowledge about enduring and stable human traits and characteristics. Personality psychologists are interested in investigating human thoughts, beliefs, attitudes etc., and the biological and psychosocial factors that influence their behavior and personality.