Roberto Assagioli was an Italian psychiatrist and pioneer in the fields of humanistic and transpersonal psychology. Assagioli founded the psychological movement known as psychosynthesis, which is still being developed today by therapists and psychologists who practice the psychological methods and techniques he developed. His work, including two books and many monographs published as pamphlets, emphasized the possibility of progressive integration of the personality.

Alice Ann Bailey was a writer of more than twenty-four books on theosophical subjects, and was one of the first writers to use the term New Age. Bailey was born as Alice La Trobe-Bateman, in Manchester, England. She moved to the United States in 1907, where she spent most of her life as a writer and teacher.