Hans Kelsen

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Lore & Background

Kelsen was born in Prague into a middle-class, German-speaking, Jewish family. He moved to Vienna in 1884, studied law at the University of Vienna, and earned his doctorate in 1906. He converted to Roman Catholicism in 1905 and later to Lutheranism in 1912. He married Margarete Bondi in 1912, and they had two daughters. His early work on Dante's theory of state examined the 'two swords doctrine' of Pope Gelasius I and the Guelph-Ghibelline debates. He studied at Heidelberg under Georg Jellinek, solidifying his view of the identity of law and state, rejecting dualistic theories like Jellinek's self-limitation of the state. In 1911, he achieved habilitation with a thesis on public law theory. He became a full professor at the University of Vienna in 1919 and was the principal architect of the 1920 Austrian Constitution, later serving on the Constitutional Court for life.

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 invented the modern European model of constitutional review, first introduced in Austria and Czechoslovakia in 1920, establishing a separate constitutional court with sole responsibility over constitutional disputes. His work on the identity of law and state countered the views of Carl Schmitt and others. Despite being lauded by Roscoe Pound in 1934 as 'unquestionably the leading jurist of the time,' his pure theory was rarely understood in the United States, and he never held a permanent law school position there. Forced out of Austria by totalitarianism, he moved to Germany, Switzerland, and finally the United States in 1940. He taught in the department of politics at the University of California, Berkeley from 1942 until official retirement in 1952, and later expanded his 1934 book 'Reine Rechtslehre' into a second edition in 1960, translated into English in 1967.

Did You Know?

• Kelsen was baptized as a Roman Catholic on June 10, 1905, the same year he completed his study of Dante's political theory.
• On May 25, 1912, he married Margarete Bondi; both had converted to Lutheranism of the Augsburg Confession a few days earlier.
• He 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 never held a permanent position in a law school in the United States; from 1942 to 1952 he worked in the department of politics at the University of California, Berkeley.

The Pure Theory and Its Reception

Kelsen's most enduring intellectual contribution was a framework he called the pure theory of law (Reine Rechtslehre), designed to furnish a general foundation for describing legal systems without importing moral, political, or sociological judgments into the analysis. The theory aimed to strip law of external contamination so that its internal normative structure could be examined on its own terms. He first set out the core ideas in a compact 1934 volume, then, after decades of further reflection during his American years, produced a substantially expanded second edition in 1960. An English translation followed in 1967, finally opening the work to a broader Anglophone readership. Despite Roscoe Pound's 1934 declaration that Kelsen was "unquestionably the leading jurist of the time," the pure theory remained largely opaque to American legal scholars, a gap that persisted throughout Kelsen's career on the West Coast. The theory's insistence on methodological purity—treating law as a self-contained normative system rather than a projection of state power or social will—distinguished it sharply from the dualistic traditions he had encountered in Vienna and Heidelberg.

Constitutional Craftsmanship and the Vienna Chair

Beyond his theoretical writings, Kelsen left a concrete institutional legacy that continues to shape governance. As a specialist in constitutional law, he was the chief designer of the 1920 Austrian Constitution, a document that, even with subsequent amendments, remains the operative legal framework for the country. This practical achievement complemented a distinguished academic trajectory: after earning his doctorate in law in 1906 and completing his habilitation in public law and legal philosophy in 1911, he was appointed full professor of public and administrative law at the University of Vienna in 1919. His habilitation thesis, which examined the main problems of public law theory through the lens of legal statements, marked his first major foray into systematic legal philosophy. Earlier, a research scholarship had sent him to the University of Heidelberg for three semesters, where he studied under the distinguished jurist Georg Jellinek. That encounter proved formative, pushing Kelsen to reject the prevailing dualistic separation of law and state and instead champion their identity—a conviction that would underpin everything he built afterward.

Exile and the American Interregnum

The political upheavals of the 1930s uprooted Kelsen from the world he had helped shape. The rise of totalitarianism drove him successively out of Austria, then through Germany and Switzerland, until he reached the United States in 1940. His arrival in America was marked by a bitter irony: while the eminent jurist Roscoe Pound had publicly hailed Kelsen as the leading legal thinker of the era, the pure theory found almost no receptive audience in U.S. legal academia. Kelsen was never offered a permanent chair in any American law school. Instead, from 1942 until his official retirement in 1952, he held a position in the department of politics at the University of California, Berkeley. It was during these West Coast years, long after the events that had displaced him, that he undertook the monumental task of rewriting and vastly expanding his 1934 monograph into the second edition of Reine Rechtslehre, published in 1960 and translated into English in 1967. The exile thus became, paradoxically, the period of his most sustained creative output.

Faith, Dante, and the Formation of a Legal Mind

Kelsen's intellectual and personal formation was shaped by a series of striking transitions. Born in Prague in 1881 into a middle-class, German-speaking Jewish family, he moved to Vienna at age three. His early academic work, a 1905 study of Dante's political theory examining the two-swords doctrine of Pope Gelasius I and the Guelph-Ghibelline debates, coincided with his baptism as a Roman Catholic in June of that year. A few years later, on the eve of his 1912 marriage to Margarete Bondi, both converted to Lutheranism of the Augsburg Confession; the couple went on to have two daughters. The Dante study was more than a literary exercise: in its closing chapter, Kelsen traced a historical line from Dante through Machiavelli and Jean Bodin to the emergence of modern legal order, using Machiavelli as a cautionary example of executive power untethered from legal restraint. This orientation toward government strictly according to law, with a heightened emphasis on judicial review, became a defining thread in his mature thinking.