Rollo Reece May was an American existential psychologist and author of the influential book Love and Will. He is often associated with humanistic psychology and existentialist philosophy, and alongside Viktor Frankl, was a major proponent of existential psychotherapy. The philosopher and theologian Paul Tillich was a close friend who had a significant influence on his work.
As well as Love and Will, May's works include The Meaning of Anxiety and, titled in honor of Tillich's The Courage to Be, The Courage to Create.