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Sacrobosco, Johannes de

(Encyclopedia)Sacrobosco, Johannes de yōhänˈəs də săkrōbŏsˈkō [key], or John of Hollywood, c.1200–1256, English mathematician and astronomer. He wrote several widely read and influential books: Algorism...

Tillich, Paul Johannes

(Encyclopedia)Tillich, Paul Johannes tĭlˈĭk [key], 1886–1965, American philosopher and theologian, b. Germany, educated at the universities of Berlin, Tübingen, Halle, and Breslau. In 1912 he was ordained a m...

Bednorz, Johannes Georg

(Encyclopedia)Bednorz, Johannes Georg yōhänˈəs gāôrkhˈ bĕdˈnôrts [key], 1950–, German physicist. After earning his doctorate from the Swiss Federal Institute of Technology, he began (1982) work at the I...

Purkinje, Johannes Evangelista

(Encyclopedia)Purkinje, Johannes Evangelista yōhänˈəs āˌväng-gālĭsˈtä po͝orˈkĭnyā [key], 1787–1869, Czech physiologist. While professor (1823–50) at the Univ. of Breslau he pioneered in establish...

Vorster, Balthazar Johannes

(Encyclopedia)Vorster, Balthazar Johannes yōhänˈəs bältäzärˈ fôrˈstər [key], 1915–83, South African political leader. A lawyer, John Vorster became involved in the Afrikaner nationalist movement and he...

Witteveen, H. Johannes

(Encyclopedia)Witteveen, H. Johannes (Hendrikus Johannes Witteveen), 1921–2019, Dutch economist and political leader. After receiving his doctorate from the Netherlands School of Economics (now Erasmus Univ. Rott...

Wolf, Markus Johannes

(Encyclopedia)Wolf, Markus Johannes vôlf [key], 1923–2006, East German spymaster. A legendary cold-war espionage chief, he was called “the man without a face” because until 1978 there was no known photograp...

Jensen, Johannes Hans Daniel

(Encyclopedia)Jensen, Johannes Hans Daniel, 1907–73, German physicist, Ph.D. Univ. of Hamburg, 1932. Jensen was a professor at the Technical Univ. of Hanover from 1941 to 1949, when he joined the faculty at Heide...

Kayser, Heinrich Gustav Johannes

(Encyclopedia)Kayser, Heinrich Gustav Johannes hīnˈrĭkh go͝osˈtäf yōhänˈəs kīˈzər [key], 1853–1940, German physicist. He was professor at Bonn from 1894 to 1920. He is known for his work in sound and...

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