what would later become the Vidovdan Constitution. For more than four decades, Jovanović taught at the law faculty gaining a reputation as an authority on constitutional law and Serbian language and literature. He was Rector of the University of Belgrade on two separate occasions and Dean of Faculty of Law. Jovanović joined the Serbian Royal Academy in 1908, and was its President from 1928 to 1931. He was also a correspondent member of the Yugoslav Academy of Sciences and Arts in Zagreb from 1927. Slobodan Jovanović was a critic of Hans Kelsen's Pure Theory of Law. His primary remarks are on the relation of Kelsen's theory to other German theorists at the time. He considered Kelsen an innovative "young" theorist, but thought that his framework was not as dissimilar to more classical theories that Kelsen, in Jovanović's opinion, tried to attack. Namely, Jovanović posited that the special position of the Basic norm for Kelsen could be reduced to the framework of more classical German theories, in which the state is a legal person from which the legal system originates, and vice versa. Jovanović considered this to be a flaw of Kelsen's Legal positivism that makes it a theory that does not truly address the origins of the law, as it fails to truly separate in analysis the legal system from the state as an actor. In this way, Jovanović rejects an analysis that would fully divorce the man as a legal creature, from man as a political one. Jovanović had some influence on political life in the Kingdom of Yugoslavia due to his well established authority in the field of law and history, but he entered directly political life only in 1939 when the Serbian Cultural Club was established, and he was appointed as Club's president. He was a pro-Western politician and when a pro-Western military coup took place in Belgrade on 27 March 1941, a pro-Western, essentially pro-British government was installed headed by General Dušan Simović. Jovanović was deputy Prime Minister in that government. The Third Reich attacked the Kingdoms of Yugoslavia and Greece on 6 April, and soon defeated Yugoslav and Greek forces. Jovanović moved in mid April together with King Peter II and other cabinet ministers to Jerusalem and he reached London in July. He became prime minister of the Yugoslav government-in-exile during World War II on 11 January 1942 and remained in that position until 26