Tadeusz Kotarbiński
Tadeusz Marian Kotarbiński (Polish: [kotar'biński]; 31 March 1886 – 3 October 1981) was a Polish philosopher, logician and ethicist. A pupil of Kazimierz Twardowski, he was one of the most representative figures of the Lwów–Warsaw School, and a member of the Polish Academy of Learning (PAU) as well as the Polish Academy of Sciences (PAN). He developed philosophical theory called reism (Polish: reizm) and an ethical system called independent ethics. Kotarbiński also contributed significantly to the development of praxeology. Henryk Greniewski and Kazimierz Pasenkiewicz were doctoral students under Kotarbiński.