
Rollo May
Rollo Reece May was an American existential psychologist and author of the influential book Love and Will (1969). 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.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The discovery of being
2015
ISBN 9780393350869