Lawrence Kohlberg (; October 25, 1927 – January 17, 1987) was an American psychologist best known for his theory of stages of moral development. He served as a professor in the Psychology Department at the University of Chicago and at the Graduate School of Education at Harvard University. Even though it was considered unusual in his era, he decided to study the topic of moral judgment, extending Jean Piaget's account of children's moral development from 25 years earlier. In fact, it took Kohlberg five years before he was able to publish an article based on his views.
https://en.wikipedia.org/wiki/Lawrence_Kohlberg