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Willy Marckwald (1864, Jakobskirch, Kingdom of Prussia – 1942, Rolândia, Brazil) Guide to the Willy Marckwald Collection, 1931-1934, AR 10156. Leo Baeck Institute Archives. Center for Jewish History was a German chemist.
By his research on , Marckwald received his Habilitation Marckwald - Publikationsübersicht 1888–1896 in a very short time in 1889 under the supervision of A. W. Hofmann at Friedrich-Wilhelms-Universität Berlin. In 1899 Marckwald became one of the department heads at the Second Chemical Institute. Historie II. Chem. Institut: Vorstand (chief executive) to 1891 Carl Rammelsberg, 1891–1904 Hans Heinrich Landolt, 1905–1923 Walter Nernst, from 1923 Max Bodenstein. - Bunsenstraße 1, Berlin. In 1905 the Second Chemical Institute (II. Chemische Institut) was renamed the "Physikalisch-Chemisches Institut" (the Institute of Physical Chemistry). He held this Privatdozent-level position until his age-related retirement in 1930.
From 1928 to 1931 he was the board chair of the German Chemical Society.
In 1890 Marckwald married Margarete Salomon (1871–1908). Their marriage produced two sons, Friedrich (1892–1917), who died in World War I as a naval aviator, and Johann (1902–1986). In 1936 Willy Marckwald, with his son Johann and his daughter-in-law Prisca, became immigrants in Brazil.
At the Second Chemical Institute, Marckwald did pioneering research on kinetic resolution and stereoselective synthesis. Three of his outstanding achievements were:
At the Second Chemical Institute under Landolt's direction, Marckwald beginning in 1900 turned increasingly toward theory „Die Benzoltheorie“ von W. Marckwald, 1898 but also to the inorganic chemistry of radioactive compounds. He collaborated on Landolt's sections in the textbook Graham-Otto's ausführlichem Lehrbuch der Chemie. From 5 metric tons of uranium ore, in 1902 Marckwald succeeded in isolating 3 milligrams of polonium, which he provisionally ( vorläufig) named radio-tellurium. Die 14. Hauptversammlung der Bunsengesellschaft. In: Polytechnisches Journal. Band 322, 1907, Miszelle 1, Seite 364.: „3 mg Poloniumsalz aus 5.000 kg Uranerz“. In 1904 he published a monograph on radioactivity. „Über Bequerelstrahlen und radio-aktive Substanzen“. Moderne Ärztliche Bibliothek, Heft 7 (1904)
In 1911 Marckwald and Alexander Smith Russell published evidence suggesting that the radioactive thorium isotope 230Th and ionium are identical.
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