Johann Stieglitz

Johann Stieglitz, born as Israel Stieglitz (10 March 1767, Arolsen – 31 October 1840, Hanover) was a German medical doctor. He was the brother of banker Ludwig von Stieglitz (1779-1843) and uncle to poet Heinrich Wilhelm Stieglitz (1801-1849).

Initially a philosophy student in Berlin, he later studied medicine at the University of Göttingen. In 1789 he moved to Hanover as a physician, successively serving as Hofmedikus (from 1802, court physician), Leibmedikus (from 1806), Hofrat (from 1820, councillor) and Obermedizinalrat and director of Hanover medical colleges (1832).

Known for his criticism of perceived "heresies of medicine", he was a vigorous opponent of speculative medical theories that included mesmerism and the Brunonian system.