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

Developmental psychologist - Personality psychologist.

Explanation:

As the exercise suggests, Dr. Chen is a developmental psychologists, a professional who focuses and studies in how people grow and change during adolescense and young adulthood, whereas Dr. Doherty focuses on several traits that distinguish one person from another, making her a personality psychologist. The first science, as it's name implies, focuses on the growth of an individual in their entire lifespan. The latter, obvserves social situations and how they are influenced by individual emotion and conduct; focusing on that individual's behavior.