Stefanie Horovitz

Stefanie Horovitz (1887–1942) (Stefania Horovitz or Stephanie Horowitz) was a Polish-Jewish chemist known for experimental work proving the existence of isotopes. Between approximately 1914–1918, she worked with Otto Hönigschmid at the Radium Institute of Vienna using analytical methods to demonstrate the first and second credible cases of isotopes in lead and thorium. Her father was the artist Leopold Horovitz, a successful painter known for Baroque style portraiture. Her mother's maiden name was Rosa London

She was educated at the University of Vienna beginning in 1907, and her doctoral research was on the rearrangement of quinone using sulfuric acid. In a major career shift, she established a foster home in Vienna providing therapy for children with Alice Friedmann, an Adlerian psychologist. Other sources explain that Horovitz and her sister reported themselves to Umschlagplatz in 1942 to avoid endangering others, but the details are unclear. They were transported to the Treblinka extermination camp and were among 900,000 Jews who did not survive there. Records indicate Horovitz was murdered in a gas chamber in 1942.

Published works