Hermann Karl Hesse (1877-1962) was a German-Swiss poet, novelist, and painter. Along with Siddhartha, his best-known works include Demian (1922), Steppenwolf (1927), Narcissus and Goldmund (1933), and The Glass Bead Game (1943), each of which explores an individual's search for authenticity, self-knowledge, and spirituality. He received the Nobel Prize in Literature in 1946. He died on August 9, 1962.

Alan Wilson Watts (1915-1973) was an English writer, theologian, and speaker known for interpreting and popularizing Buddhism, Taoism, and Hinduism for a Western audience. He wrote more than twenty-five books and articles on religion and philosophy, including The Way of Zen (1957), one of the first bestselling books on Buddhism. He died on November 16, 1973, at his cabin in Druid Heights, California.