Kazimierz Jerzy Skrzypna-Twardowski (20 October 1866 – 11 February 1938) was a Polish philosopher, psychologist, logician, and rector of the Lwów University. He was initially affiliated with Alexius Meinong's Graz School of object theory. Life Twardowski's family belonged to the Ogończyk coat of arms. Twardowski studied philosophy at the University of Vienna with Franz Brentano and Robert von Zimmermann. In 1891 he received his doctorate with his dissertation, Idee und Perzeption (Idea and Perception), and in 1894 he presented his habilitation thesis Zur Lehre vom Inhalt und Gegenstand der Vorstellungen (On the Doctrine of the Content and Object of Presentations) at Vienna. He originated many novel ideas related to metaphilosophy. He lectured at the University of Vienna in the years 1894–95. In 1895 was appointed professor at Lwów (Lemberg in Austrian Galicia, now Lviv in the Ukraine). An outstanding lecturer, he was also a rector of the Lwów University during World War I. There Twardowski soon established the Lwów–Warsaw school of logic and became the "father of Polish logic". Among his students were the logicians Stanisław Leśniewski, Jan Łukasiewicz and Tadeusz Czeżowski, the psychologist Władysław Witwicki, the historian of philosophy Władysław Tatarkiewicz, the phenomenologist and aesthetician Roman Ingarden, as well as philosophers close to the Vienna Circle such as Tadeusz Kotarbiński and Kazimierz Ajdukiewicz. Twardowski also established the Polish Philosophical Society in 1904, the first laboratory of experimental psychology in Poland in 1907, and the journal in 1911. He officially retired in 1930. Work In his 1894 book On the Content and Object of Presentations (also known as On the Doctrine of the Content and Object of Presentations), Twardowski argues for a distinction between content and object in the frame of the theory of intentionality of his teacher Franz Brentano. According to him the mind is divided in two main areas: acts or mental phenomena, and a physical phenomenon. For example, an act of presentation is aimed at a presentation. This is what he called ‘intentionality’, aboutness. Every act is about something, but also every presentation goes together with an act of presentation. This theory suffers from the problem that it is not clear what the presentation exactly is. Is the presentation something only in the mind, or is it also in the world as object? Twardowski says that sometimes presentation is used for the object in the world and sometimes for the immanent content of a mental phenomenon. Twardowski