Panagiotis Trempelas is considered the most productive Greek theologician of the 20th century. He studied in the University of Athens from ehich he graduated in 1907. He was elected Professor of Practical Theology in the same university in 1939, a chair he held until 1957. He was also one of the founders of the 'Zoi' and later of 'Sotir'.
Konstantinos Mouratidis, Παναγιώτης Τρεμπέλας Ο μεγάλος πρόμαχος της ορθοδοξίας (Panagiotis Trempelas, the great defender of Orthodoxy), Orthodoxos Typos Press, Athens, 1985