In 1932, Lili Elbe published the book titled "Ein Mensch Weschselt Sein Geschlecht" (A man changes his sex), edited by Niels Hoyer (a pseudonym for Ernst Harthern).
The book is about Lili Elbe, also known as Lili Ilse Elvenes, a Danish painter and transgender woman, one of the first recipients of gender reassignment surgery in the world, an experience recounted in her posthumously published memoir, Man Into Woman, and the subject of the 2000 book and 2015 film, The Danish Girl.
In 1954, Niels Hoyer published the same book under his name and with a slightly changed title: "Wandlung: Eine Lebensbeichte" (Conversion: A confession of life).
