In August of the same year, he was appointed professor of the Greek language in the First Belgrade Gymnasium by decree.
[7] At the juncture, in that period of time, great discoveries in the field of medicine were being made by physicians both at home and abroad.
The need to find ways to regularly follow the daily innovations in medicine in particular and in health in general presented itself.
One way was to establish a medical society, where all physicians could exchange experiences, prepare or listen to lectures.
Papakostopoulos was married to Ephthalia, who bore him five children: Pericles; Euphrosyne; Plato; Aspasia; and Cleanta.