Eduard Zeller studied in he University of Tübingen, in which he became a Privatdozent of Theology in 1840. He was elected Professor of Theology in Berne in 1847, in Marburg in 1849, in Heidelberg in 1862 and finally in Berlin in 1872, from which he retired in 1895. Apart from Theology, his most famous work concerns the History of Philosophy and especially the development of ancient Greek philosophy.

Georgios Koressios was one of the most important Greek theologians and scholars of the 17th century. Born on the island of Chios between 1567 and 1570, he studied Philosophy and Medicine at the University of Padua. In 1611 he was appointed professor of Greek language and literature at the University of Pisa, where he demonstrated his strong admiration for the work of Aristotle. During his years in Pisa, he engaged in an ideological conflict with his colleague Galileo Galilei, based on the latter's writings on the nature of solid bodies.