Carol Gilligan was born in 1936 and received her PhD from Harvard in 1964. She began studying under Lawrence Kohlberg but developed her own theory of moral development after feeling his work was biased by only studying privileged white men. Gilligan's theory proposes three stages of moral development - selfish, social/conventional, and post-conventional morality - and argues women's sense of morality centers on caring for relationships rather than rules. Her 1982 book "In a Different Voice" criticized psychological views that saw women's morality as stunted.