Tadeusz Kazimierz Estreicher (19 December 1871 – 8 April 1952) was a Polish chemist, historian and cryogenics pioneer.
His brother, Stanisław, was a historian of law and his sister, Maria, was one of the first women in Austria-Hungary to earn a doctorate (in English Philology).
As a student at the Jagiellonian University, Estreicher worked as an assistant to Karol Olszewski, the first chemist to liquefy oxygen.
[1] From 1906 until 1919 he worked in Switzerland a professor for mineral and general chemistry at the University of Fribourg where he ran a cryogenics laboratory.
Tadeusz survived the camp and was released in February 1940, following protests from European academics to the Nazi German government.