Károly Erdős (1887-1971) began his teaching and research career as a teacher of church history at the Reformed College in Debrecen. After the Faculty of Reformed Theology became part of the university, which began to function in 1914, Erdős became a teacher and later director of the Institute for the Training of Ministers of the Reformed Church. In 1929 he was appointed professor in the New Testament Department of the Tisza István University. As an university professor and pastor, he rendered great service to the city and the Church, both as a teacher and as a scholar. After 1949 he became a professor at the Reformed Theological Academy in Debrecen.