J. Sadger

Born in Galicia in 1867, J. Sadger was the pen name of Isidor Isaak Sadger, a physician and psychoanalyst who worked in Vienna. He trained in medicine, began his career as a neurological specialist, and became one of the early figures associated with Sigmund Freud and the first psychoanalytic movement.

He published on psychophysiology and wrote extensively on subjects that were controversial for his time, including homosexuality, fetishism, dreams, and related areas of psychoanalytic theory. He is also remembered for helping introduce the term sadomasochism into psychoanalytic discussion, and for medico-literary works such as Sleep Walking and Moon Walking.

Sadger died in 1942 during the Nazi era. Though not as widely known today as some of his contemporaries, his writings remain of interest to readers exploring the early history of psychoanalysis and its more experimental, speculative literature.