Maslow became the leader of the humanistic school of psychology that emerged in the 1950s and 1960s, which he referred to as the "third force" -- beyond Freudian theory and behaviorism.

From Aristotle to Sigmund Freud and Abraham Maslow ... of being over time—even given that the person’s personality is influenced by genetics. Who created Social Investment Theory?

But here’s something many don’t know: Maslow developed this concept after spending time with the Blackfoot ... the Blackfoot Tribe to test his theory that social hierarchies are maintained ...