The major theorists considered to have prepared the ground for Humanistic Psychology are Otto Rank, Abraham Maslow, Carl Rogers and Rollo May. Maslow was heavily influenced by Kurt Goldstein during their years together at Brandeis University.Psychoanalytic writers also influenced humanistic psychology.ne of humanistic psychology's early sources was the work of Carl Rogers, who was strongly influenced by Otto Rank, who broke with Freud in the mid-1920s.