Stelios graduated from the Veterinary Faculty of the Aristotle University of Thessaloniki in 2011.
In 2014 he completed a two years rotating-internship program in anesthesia and surgery at the Veterinary Small Animal Surgery department and obstetrics of small animal at department of Obstetrics and Reproduction, of University of Thessaly.
From 2015, he continues to attend congress of small animal surgery and anesthesia.