Final answer:
The three psychologists who focused on adolescent development are Gilligan, Erikson, and Havighurst. Gilligan studied gender differences in moral development, Erikson developed a theory of personality development, and Havighurst focused on the tasks people must complete at each stage of their lives.
Step-by-step explanation:
The three psychologists who focused their work on adolescent development are Gilligan, Erikson, and Havighurst.
Carol Gilligan added the dimension of gender differences to Lawrence Kohlberg's theory of moral development.
Erik Erikson developed a theory of personality development that includes eight stages, beginning with birth and ending with death.
Robert Havighurst studied human development and proposed a theory that focuses on the tasks that people must complete at each stage of their lives.