Short answers, pulled from the story.
Rollo Reece May (the 21st of April 1909 - the 22nd of October 1994) was an American existential psychologist, author, and a major proponent of existential psychotherapy. He is best known for his book Love and Will (1969), which won the Ralph Waldo Emerson Award and became a best-seller, and for The Meaning of Anxiety (1950), which argued that anxiety is essential for human growth.
May defined anxiety as "the apprehension cued off by a threat to some value which the individual holds essential to his existence as a self." He concluded from his time in a tuberculosis sanatorium that anxiety is unavoidable and essential for individual growth, and he proposed that converting anxiety into a specific fear can reduce overall anxiety because "anxiety seeks to become fear."
May identified Libido (biological sexual function), Eros (psychological desire for enduring union), Philia (intimate non-sexual friendship), Agape (disinterested concern for another's welfare), and Manic love (impulsive, emotionally volatile love that oscillates between extremes). He outlined these in his 1969 book Love and Will.
May described three aspects of the world: Umwelt ("the world around us," encompassing biological and genetic influences below conscious awareness), Mitwelt ("the world," the social environment where meaning arises from shifting relationships), and Eigenwelt ("our own world," the conscious psychological interior where self-awareness and identity form).
May won the Ralph Waldo Emerson Award for humane scholarship in 1970 for Love and Will, the American Psychological Association's Distinguished Contribution to Science and Profession of Clinical Psychology award in 1971, the New York Society of Clinical Psychologists' Dr. Martin Luther King, Jr., Award in 1972 for Power and Innocence, and the American Psychological Foundation Gold Medal Award for Lifetime Contributions to Professional Psychology in 1987.
May was influenced by Alfred Adler, with whom he studied in Greece, and by Paul Tillich, the philosopher and theologian who was a close friend. He drew significantly on Freud, Otto Rank (whom he called "the great unacknowledged genius in Freud's circle"), Erich Fromm, and Abraham Maslow. May considered Rank to be the most important precursor of existential therapy.