German medical writers

Karl M. Baer (20 May 1885 – 26 June 1956) was a German-Israeli author, social worker, reformer, suffragist and Zionist.
Born intersex and assigned female at birth, he came out as a trans man in 1904 at the age of 21. In December 1906, he became the first transgender person to undergo sex reassignment surgery, and he became one of the first transgender people to gain full legal recognition of his gender identity by having a male birth certificate issued in January 1907. However, some researchers have disputed his label as a trans man, theorizing that he was intersex, and not transgender.Baer wrote notes for sexologist Magnus Hirschfeld on his experiences growing up female while feeling inside that he was male. Together they developed these notes into the semi-fictional, semi-autobiographical Aus eines Mannes Mädchenjahren (Memoirs of a Man's Maiden Years) (1907) which was published under the pseudonym N.O. Body. The book "was immensely popular," being "adapted twice to film, in 1912 and 1919." Baer also gained the right to marry and did so in October 1907.
Despite him having undergone gender reaffirming surgery in 1906, exact records of the medical procedures he went through are unknown, as his medical records were burned in the 1930s Nazi book burning, that targeted Hirschfield studies specifically.

Friedrich Wolf (23 December 1888 – 5 October 1953) was a German doctor and politically-engaged writer. From 1949 to 1951, he served as East Germany's first ambassador to Poland.

Carl Ludwig Schleich (19 July 1859 – 7 March 1922) was a German surgeon and writer. He is best known for his contribution to clinical anesthesia. In addition, he was also a philosopher, poet and painter.

Peter Bamm (a pen name; his real name was Curt Emmrich; 20 October 1897 in Hochneukirch, now part of Jüchen, Germany – 30 March 1975 in Zollikon, Switzerland) was a German writer.
Peter Bamm volunteered for military service in World War I, after which he studied medicine and sinology in Munich, Göttingen and Freiburg im Breisgau. As a ship's doctor he travelled the world a great deal before eventually settling in Berlin-Wedding.
During World War II he served as a military doctor on the Russian Front, and later described his experiences in the book "Die Unsichtbare Flagge" (The Invisible Flag). After the war he travelled for study purposes between 1952 and 1957 in the Near and Middle East, after which he wrote as a journalist and feature writer for a number of Berlin newspapers.
He is buried in the Stöcken Cemetery in Hanover.