Hans Kelsen
Austrian-American jurist known for the pure theory of law.
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Hans Kelsen (1881–1973) was an Austrian-born jurist and philosopher who later became a U.S. citizen. He is best known for developing the "pure theory of law" (*Reine Rechtslehre*), a framework for describing law without relying on moral or political values. He also wrote extensively on international law and democratic theory. A constitutional law expert, Kelsen was the main drafter of Austria’s 1920 constitution, which—with later amendments—is still in effect.
Forced to flee Europe due to the rise of totalitarianism, Kelsen moved from Austria to Germany, then to Switzerland, and finally to the United States in 1940. Although Roscoe Pound called him “unquestionably the leading jurist of the time” in 1934, his pure theory was rarely understood in America, and he never secured a permanent position at a U.S. law school. From 1942 until his official retirement in 1952, he worked in the politics department at the University of California, Berkeley. After retiring, he expanded his 1934 book *Reine Rechtslehre* into a much larger second edition, published in 1960 and translated into English in 1967.
Kelsen was born in Prague to a middle-class, German-speaking Jewish family. His father Adolf came from Galicia, his mother Auguste Löwy from Bohemia. He was the eldest of four children. The family moved to Vienna in 1884. After attending the Akademisches Gymnasium, he studied law at the University of Vienna, earning his doctorate in 1906 and his habilitation in 1911. He converted to Roman Catholicism in 1905, around the time of his dissertation on Dante. In 1912, he married Margarete Bondi; the couple converted to Lutheranism just before the wedding, and they had two daughters.
Kelsen’s first book on political theory, from 1905, examined Dante’s views on the state, particularly the “two swords doctrine” and the Guelph-Ghibelline debates. His conversion to Catholicism coincided with finishing that work. After earning his doctorate, he studied at the University of Heidelberg for three semesters in 1908 under the jurist Georg Jellinek. In his Dante study, Kelsen traced the historical path leading to modern law, highlighting Machiavelli and Jean Bodin as key figures. He saw Machiavelli’s work as a warning against an unchecked executive, which pushed Kelsen toward a legal system strictly bound by law and with strong judicial review.
At Heidelberg, Kelsen began to develop his view that law and state are identical, rejecting the dualistic theories then common. He criticized Jellinek’s idea of the state’s “self-limitation” as a pseudo-problem, arguing that personifying the state as a separate entity was a fallacy. The French jurist Léon Duguit agreed, noting that voluntary self-limitation is not real subordination. This critique helped Kelsen solidify his own monistic position.
- born
- October 11, 1881, Prague
- died
- April 19, 1973
- field
- Jurisprudence, legal philosophy, political philosophy
- nationality
- Austrian, later American
- known_for
- Pure theory of law (Reine Rechtslehre), architect of the 1920 Austrian Constitut
Verified Timeline
Lore & Background
Kelsen was born in Prague into a middle-class, German-speaking, Jewish family. The family moved to Vienna in 1884. He studied law at the University of Vienna, taking his doctorate in law on 18 May 1906 and his habilitation on 9 March 1911. He was baptised as a Roman Catholic on 10 June 1905. On 25 May 1912 he married Margarete Bondi, the two having converted a few days earlier to Lutheranism of the Augsburg Confession; they had two daughters. His early work on Dante's political theory examined the "two swords doctrine" of Pope Gelasius I and the Guelph-Ghibelline debates. In 1908, studying for his habilitation, he won a research scholarship to attend the University of Heidelberg for three consecutive semesters, where he studied with Georg Jellinek. There he began to solidify his position on the identity of law and state, rejecting dualistic theories of self-limitation. In 1911, his habilitation thesis became his first major work on legal theory, Hauptprobleme der Staatsrechtslehre entwickelt aus der Lehre vom Rechtssatze. In 1919, he became full professor of public and administrative law at the University of Vienna. At the behest of Chancellor Karl Renner, Kelsen worked on drafting a new Austrian Constitution, enacted in 1920. He was appointed to the Constitutional Court for his lifetime.
Reader's Guide
Kelsen's significance lies in his pure theory of law, which sought to describe law without moral or political values, and in his practical contributions to constitutional law. He was the principal architect of the 1920 Austrian Constitution, which introduced the modern European model of constitutional review through a separate constitutional court. This model was first introduced in both Austria and Czechoslovakia in 1920, and later in the Federal Republic of Germany, Italy, Spain, Portugal, as well as in many countries of Central and Eastern Europe. The rise of totalitarianism forced him out of Austria, then to Germany and to Switzerland and in 1940 to the United States. Although in 1934 Roscoe Pound lauded Kelsen as "unquestionably the leading jurist of the time", the pure theory was rarely understood in the United States and Kelsen was never given a permanent position in a law school. He was employed in the department of politics at the University of California, Berkeley from 1942 until official retirement in 1952. He then rewrote his short book of 1934, titled Reine Rechtslehre, into a much enlarged "second edition" published in 1960; it appeared in an English translation in 1967. His legacy includes his monistic theory of law and state, his critique of Carl Schmitt's advocacy for the priority of the political concerns of the state, and his enduring influence on legal positivism and international law.
Did You Know?
- Kelsen was baptised as a Roman Catholic on 10 June 1905, and later converted to Lutheranism of the Augsburg Confession on 25 May 1912.
- He studied under distinguished jurist Georg Jellinek at the University of Heidelberg for three consecutive semesters starting in 1908.
- Kelsen was the principal architect of the 1920 Austrian Constitution, which, with amendments, remains in force.
- In 1934, Roscoe Pound lauded Kelsen as 'unquestionably the leading jurist of the time'.
- Kelsen was never given a permanent position in a law school in the United States; he worked in the department of politics at the University of California, Berkeley from 1942 until 1952.
Frequently Asked Questions
Who is Hans Kelsen?
Hans Kelsen was an Austrian-born jurist and legal philosopher who later became an American citizen. He is most widely recognized for developing the Pure Theory of Law and for shaping modern constitutional thought.
What is the Pure Theory of Law (Reine Rechtslehre)?
It is Kelsen's framework for describing legal systems without importing moral or political values into the analysis. The approach treats law as a self-contained normative structure governed by a hierarchy of norms.
What did Hans Kelsen do for Austrian governance?
He served as the principal architect behind the 1920 Austrian Constitution, designing its structure and principles. That document, though amended over the decades, is still the governing constitutional framework in Austria today.
Why is Hans Kelsen considered important in legal scholarship?
His work provided a rigorous, value-neutral method for analyzing how legal orders function, influencing generations of jurists and political theorists. He also made significant contributions to the study of international law and democratic theory.
Where and when was Hans Kelsen born?
He was born on October 11, 1881, in Prague. He passed away on April 19, 1973, having spent the latter part of his career in the United States.
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