From 1894 to 1902 he was at the university of Texas as adjunct professor of political science, professor (after 1900), and dean of the faculty (after 1899).
He graduated in 1840 from Lafayette College, where he was tutor in mathematics (1840-1842) and adjunct professor (1843-1844).
In 1817, after the publication of his first work, Aegineticorum liber, he received an appointment at the Magdaleneum in Breslau, and in 1819 he was made adjunct professor of ancient literature in the university of Gottingen, his subject being the archaeology and history of ancient art.
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He was an assistant in philosophy at Columbia in 1885-1886, tutor in 1886-1889, adjunct professor of philosophy, ethics and psychology in 1889-1890, becoming full professor in 1890, and dean of the faculty of philosophy in 1890-1902.