Maslow was one of the foremost spokespersons of humanistic psychology. In The Farthest Reaches of Human Nature, an extension of his classic Toward a Psychology of Being, Maslow explores the complexities of human nature by using both the empirical methods of science and the aesthetics of philosophical inquiry. With essays on biology, synergy, creativity, cognition, self-actualization, and the hierarchy of needs, this posthumous work is a wide-ranging synthesis of Maslow's inspiring and influential ideas.