Edmund Gustav Albrecht Husserl (; German: [ˈhʊsɐl]; 8 April 1859 – 27 April 1938) was a German philosopher who established the school of phenomenology. In his early work, he elaborated critiques of historicism and of psychologism in logic based on analyses of intentionality. In his mature work, he sought to develop a systematic foundational science based on the so-called phenomenological reduction. Arguing that transcendental consciousness sets the limits of all possible knowledge, Husserl re-defined phenomenology as a transcendental-idealist philosophy. Husserl's thought profoundly influenced the landscape of twentieth-century philosophy, and he remains a notable figure in contemporary philosophy and beyond.