Scholars have noted PBL is consistent with John Dewey's educational theories and with constructivist philosophies. This paper explores the similarities between the assumptions within Howard Barrows' principles for the PBL tutor's actions with Dewey's theories that address teacher behaviors and with Carl Rogers's conceptual frameworks that support the therapeutic behaviors of the client-centered therapist. In doing so it recognizes Barrows' integration of the educational and cognitive psychology concepts of two psychologists who have influenced the psychology of education and provides an additional conceptual and theoretical anchor for PBL tutor facilitation skills.