Gustav Friedrich Waagen (1794-1868), German art historian, was born in Hamburg, the son of a painter and nephew of the poet Ludwig Tieck. Having passed through the college of Hirschberg, he volunteered for service in the Napoleonic campaign of 1813-1814, and on his return attended the lectures at Breslau University. He devoted himself to the study of art, which he pursued in the great European galleries, first in Germany, then in Holland and Italy. A pamphlet on the brothers Van Eyck led to his appointment to the directorship of the newly founded Berlin Museum in 1832. The result of a journey to London and Paris was an important publication in three volumes, Kunstwerke and Kiinstler in England and Paris (Berlin, 1837-1839), which became the basis for his more important The Treasures of Art in Great Britain (London, 1854 and 1857). In 1844 he was appointed professor of art history at the Berlin University, and in 1861 he was called to St Petersburg as adviser in the arranging and naming of the pictures in the imperial collection. On his return he published a book on the Hermitage collection (Munich, 1864). Among his other publications are some essays on Rubens, Mantegna and Signorelli; Kunstwerke and Kiinstler in Deutschland and Die vornehmsten Kunstdenkmc ler in Wien. He died on a visit to Copenhagen in 1868. In the light of more recent research his writings are not of much value as regards trustworthy criticism, though they are useful as catalogues of art treasures in private collections at the time when they were compiled. His opinions were greatly respected in England, where he was invited to give evidence before the royal commission inquiring into the condition and future of the National Gallery.