Twardowski was a Brentanist, not only a pupil of Brentano, but also someone who developed his teacher's positions. This statement points to all major determinants of Twardowski's thought: like his teacher he frequently refers to the Aristotelian and scholastic tradition. Twardowski was also influenced by other prominent disciples of Brentano, mainly Meinong and Marty. Of earlier philosophers Bolzano influenced Twardowski's views to some extent.