Rollo May (April 21, 1909 – October 22, 1994) was an American existential psychologist. He was the author of the influential book Love and Will, which was published in 1969. He is often associated with both humanistic psychology and existentialist philosophy. He along with Viktor Frankl was a major proponent of "existential psychotherapy" which seeks to analyze the structure of human existence with the aim of understanding the reality underlying all situations of humans in crises ((1)). May was a close friend of the philosopher and theologian Paul Tillich, who also had a significant influence on his work. His works include "The Meaning of Anxiety", Love and Will, and The Courage to Create, the latter title honoring Tillich's The Courage to Be.