Henry Havelock Ellis, known as
Havelock Ellis (2 February 1859 – 8 July 1939), was an English physician, writer,
progressive intellectual and social reformer who studied
human sexuality. He was co-author of the first medical textbook in English on homosexuality in 1897, and also published works on a variety of sexual practices and inclinations, as well as
transgender psychology. He is credited with introducing the notions of
narcissism and
autoeroticism, later adopted by
psychoanalysis. He served as president of the
Galton Institute and, like many intellectuals of his era, supported
eugenics.