In his second year while being in Europe, he began to question the meaning of his life when he came down with tuberculosis, While being in an sanatorium, he was faced with the possibility of death, he had a lot of time to read many literatures, he came across a literatures that was on the writer named Soren Kierkegaard, who was a Danish religious writer, a person that was inspired of existential movement. May became inspired of Soren Kierkegaard words of wisdom that it gave May the inspiration of coming up with his own theory. Rollo Reese May was best known as an American existential psychologist and he was referred as the father of existential psychotherapy. May was associated with the humanistic psychology; he had a different way of thinking on the Human existence, then other psychologist, his human existence was sharper on the tragic dimension. According to Dr. C. George Boeree,on May’s personality Theories, stated that Rollo Reese May, used different terms and invented new words from some of existentialism old ideas, for example the word destiny is the same as thrownness and it is combined with the word fallenness, which mean that part of people’s lives that is determine for them, he also gave another example of the word courage, which was used more often than the traditional term authenticity, which meant facing one’s anxiety and then raise above it.According to Serlin, llene, Mays work was maintained by the balance between darkness and light, between the experiential and the intellectual. May considered the fundamental questions of human existence as the nature of evil, love and will and the meaning of anxiety and the important of myth. May inspired many people and it came from his ability to name the void of create in its face, to name evil but worked toward the good, to see meaningless, but to discover meaning and to face death, but create life. May was in the antiwar movement and many other social causes, he taught and mentored countless students and called himself a “gentle rebel”.