What is Hans Kelsen?
{{moresources}} {{Infobox philosopher | region = [[Western philosophy]] | era = [[20th-century philosophy]] | image = File:Hans Kelsen (1881–1973) ~1930 © Georg Fayer (1892–1950) OeNB 8026867.jpg | caption = Kelsen {{c.}} 1930 | name = Hans Kelsen | birth_date = {{birth date|1881|10|11}} | birth_place = [[Prague]], [[Austria-Hungary]] | death_date = {{death date and age|1973|04|19|1881|10|11}} | death_place = [[Berkeley, California]], U.S. | education = [[University of Vienna]] ([[Dr. iur.]], 1906; [[habilitation]], 1911) | school_tradition = [[Legal positivism]] | main_interests = [[Public law]]<br>[[International law]]<br>[[Philosophy of law]] | notable_ideas = [[Pure theory of law]]<br>[[Basic norm]]<br>[[Constitutional court]] | influences = [[David Hume|Hume]]{{·}}[[Immanuel Kant|Kant]]{{·}}[[Hans Vaihinger|Vaihinger]] | influenced = [[Norberto Bobbio|Bobbio]]{{·}}[[Horst Dreier|Dreier]]{{·}}[[H. L. A. Hart|Hart]]{{·}}[[Joseph Raz|Raz]]{{·}}[[Josef Laurenz Kunz|Kunz]]{{·}}{{Interlanguage link multi|Adolf Merkl|de|3=Adolf Julius Merkl|lt=Merkl}} | institutions = [[University of Vienna]]<br>[[University of Cologne]]<br>[[Graduate Institute of International and Development Studies]]<br>[[University of California, Berkeley]] | doctoral_advisor = <!--(none: Dr. Juris by examination only)--> | academic_advisors = <!--(none)--> | doctoral_students = [[Eric Voegelin]]<ref>Christian Damböck (ed.), ''Influences on the Aufbau'', Springer, 2015, p. 258.</ref><br>[[Alfred Schütz]] | thesis_title = Hauptprobleme der Staatsrechtslehre entwickelt aus der Lehre vom Rechtssätze | thesis_url = https://books.google.com/books/about/Hauptprobleme_der_Staatsrechtslehre_entw.html?id=8EHiAAAAMAAJ&redir_esc=y | thesis_year = 1911 }} '''Hans Kelsen''' ({{IPAc-en|ˈ|k|ɛ|l|s|ən}}; {{IPA-de|ˈhans ˈkɛlsən|lang}}; October 11, 1881 – April 19, 1973) was an [[Austria]]n [[jurist]], [[legal philosopher]] and [[political