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Becher, Johannes Robert

(Encyclopedia)Becher, Johannes Robert yōhänˈəs rōˈbĕrt bĕkhˈər [key], 1891–1958, German poet and essayist. After an early association with the Expressionist movement, Becher turned to Communism. His ant...

Rydberg, Johannes Robert

(Encyclopedia)Rydberg, Johannes Robert yo͞oˈhänəs rôˈbərt rüdˈbĕryə [key], 1854–1919, Swedish physicist. Rydberg was a professor at Lund from 1901 to 1919. He is best known for his grouping of the freq...

Saaz, Johannes von

(Encyclopedia)Saaz, Johannes von: see Johannes von Saaz. ...

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...

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...

Potgieter, Everhardus Johannes

(Encyclopedia)Potgieter, Everhardus Johannes āvərhärˈdəs yōhänˈəs pôtˈgētər [key], 1808–75, Dutch critic, essayist, and poet. He was the first editor (1837–65) of and a major contributor to De Gids...

Theodosius I

(Encyclopedia)Theodosius I or Theodosius the Great, 346?–395, Roman emperor of the East (379–95) and emperor of the West (394–95), son of Theodosius, the general of Valentinian I. He became (375) military gov...

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...

Sommerfeld, Arnold Johannes Wilhelm

(Encyclopedia)Sommerfeld, Arnold Johannes Wilhelm ärˈnōlt yōhänˈəs vĭlˈhĕlm zômˈərfĕlt [key], 1868–1951, German physicist and teacher. He received a Ph.D. at Königsburg Univ. in 1891 and was a prof...