An interest in Old Testament exegesis led him to postpone entry into the Lutheran seminary in order to pursue a degree at the Yale graduate school.
In 1838 he was professor-extraordinary of canon law and New Testament exegesis at Freising, but resigned when appointed canon of the cathedral in 1839.
Georg Gustav Roskoff (1814-1889) was an Austrian theologian, professor of Old Testament exegesis at Vienna University from 1850 to 1884.
In 1881 he became a professor of Old Testament exegesis at the University of Marburg, where he remained until 1900.
In 1868, he became professor of Old Testament exegesis at Kiel.
Diestel was known for his liberal-minded theological views, and specialized in Old Testament exegesis.
Many of the Sermones concern Old Testament exegesis and "have a definite anti-Semitic element in them".
He specialized in the fields of Old Testament exegesis and Semitic languages.
(1983) from the related Talbot Theological Seminary, and his Ph.D. (1986) in New Testament exegesis at the University of Aberdeen.
He was professor in early Christian literature and New Testament exegesis at Leiden University (1885-1903) and belonged to the Dutch school of Radical Criticism.