Apr 29, · Just like dogs, humans go through different developmental stages in their life, as well. Typical human development is a pretty predictable process--most humans develop at similar rates. This. Developmental psychologist Erik H. Erikson () was best known for his theory on social development of human beings, and for coining the phrase identity crisis. The theory describes eight stages through which a healthily developing human should pass from infancy to .
Jun 12, · Psychologist Daniel Levinson developed a comprehensive theory of adult development, referred to as the Seasons of Life theory, which identified stages and growth that occur well into the adult.