He was born at Schaffhausen, where his father was a clergyman and rector of the gymnasium. In his youth, his maternal grandfather, Johannes Schoop, roused in him an interest in the history of his country. At the age of eight he is said to have written a history of Schaffhausen, and at eleven he knew the names and dates of all the kings of the four great monarchies. His ardour for historical studies was further stimulated by Schlözer, when Müller went to the University of Göttingen, nominally to study theology. In July 1771 he undertook a sketch of Swiss history for a publisher of Halle, but his theological studies and the preparation of a Latin dissertation on the Bellum cimbricum prevented much progress. In April 1772 he passed his theological examination, and soon after became professor of Greek at the Collegium Humanitatis in Schaffhausen. He now began to devote his leisure hours to the investigation of Swiss chronicles and documents. Early in 1774, on the advice of his lover Charles Victor de Bonstetten, he gave up this post and became tutor in the Tronchin family at Geneva. But in 1775 he resigned this position also, and passed his time with various friends, as Francis Kinloch from South Carolina, in Geneva and Vaud, engaged in carrying his historical scheme into effect. Having accumulated much material, he began the actual composition of his work in the spring of 1776, and the printing in the summer of 1777. But difficulties arose with the censor, and matters came to a standstill. In 1778–1779 Müller delivered a set of lectures on universal history, which were published as Vierundzwanzig Bücher allgemeiner Geschichte in 1811, and often republished. In 1780 the first volume of his Geschichten der Schweizer appeared, nominally at Boston, though really at Bern; and it was well received. In 1781 he published at Berlin, in French, his Essais historiques. During his visit to Berlin, he had an interview with Frederick the Great from whom he had hoped to obtain an office, but he did not receive it. He was on his way back to Switzerland when the landgrave of Hesse-Kassel named him professor of history at the Collegium Carolinum. He stayed at Kassel till 1783, publishing in 1782 his Reisen der Päpste, a book wherein certain leanings towards Romanism are visible, also his distrust of emperor Joseph II's hegemonial politics. On his return to Geneva he accepted the post of reader to the brother of his old patron, Tronchin, and occupied himself with remodelling his published work of 1780. In order to improve his financial position, he accepted early in 1786 the post of librarian to Friedrich Karl Joseph von Erthal, the prince-elector and of archbishop of Mainz, who bestowed many important offices upon him and obtained his elevation to nobility from the emperor Leopold II. in 1791. In June 1786 he issued vol. i. and two years later vol. ii. of the definitive form of his Swiss history, which was received with great praise. In 1787 he issued an important political tract, Zur Darstellung des Fürstenbundes, and also Briefe zweier Domherren. But in October 1792 Mainz was taken by the French, so that Müller had to seek for another post. In February 1793 he entered the service of Emperor Francis II as an imperial aulic councillor. At Vienna he spent many years, becoming chief librarian of the imperial library in 1800, and in 1795 he issued vol. iii. of his Swiss history. In 1804 he became historiographer, war councillor, and member of the Academy at Berlin. In 1805 vol. iv. of his Swiss history appeared. He edited the works of Herder, and wrote various treatises for the Academy, including Über die Geschichte Friedrich's II. In 1806 he became strongly inclined towards Napoleon, by whom he was received in audience after the Battle of Jena, and from whom he accepted the office of secretary of state for the Kingdom of Westphalia, exchanging this position early in 1808 for the posts of privy councillor and general director of public instruction. At the end of 1808 he published vol. v. of his great work. He died at Kassel on 29 May 1809.
Works
Müller's works were published under the care of his brother Johann Georg Müller, pupil of Johann Gottfried Herder, at Tübingen, in 27 vols., and re-issued, in 40 vols., at Stuttgart. Vols. 1-3 contain a revised, but unfinished, German version of Müller's Universal History. The Swiss History was re-issued at Leipzig and Zurich, in 15 vols., with continuations by Robert Glutz-Blotzheim, J. J. Hottinger, Louis Vulliemin, and Charles Monnard. A French translation of the German edition appeared, in 18 vols., at Paris and Geneva. Important minor works are Essais historiques, published in French under the auspices of Frederick the Great ; Reisen der Päpste, written against the anti-papal reforms of Joseph II, although he was a Protestant; and Vierundzwanzig Bücher allgemeiner Geschichten, lectures delivered in Switzerland. Müller's letters to Füsslin were issued at Zürich, and those to Charles Bonnet, etc., at Stuttgart. Many letters addressed to him by various friends were published by Maurer-Constant, in 6 vols. ; and those written to him by his brother, Johann Georg Müller, appeared, under the editorship of Eduard Haug and André Weibel, at Frauenfeld and Göttingen.
