DRUDE, PAUL KARL LUDWIG German physicist, was born at Brunswick on July 12, 1863. He studied at Gottingen, Freiburg and Berlin. Drude was extraordinary professor of physics at Leipzig (1894-1900), professor of physics at Giessen (1900-05) , and finally, professor of physics at Berlin. His most important work was his application of Maxwell's elec tromagnetic theory, as developed by Herz, to the problems of light, and a series of papers appeared between 1896 and Some of these were on the theory of magneto-optical phenomena of iron, nickel and cobalt (1897), on the theory of anomalous dis persion (1898), on electric dispersion (1899), and on the optical constants of metals (1899). Later, Drude worked on electro magnetic oscillations. He also wrote two well-known books, which have passed through many editions and have been translated into English, Physik des Athers (1894) and Lehrbuch der Optik (1900). In 1900 he succeeded Wiedemann as the editor of the Annalen der Physik. Drude committed suicide on July 5, 1906.