He specialized and defended his doctorate at the University of Rome on the topic "Asen dynasty in Byzantium".
He is a graduate of the Vatican School of Paleography, Diplomatics and Archives Administration.
Translator of the Italian Headquarters and Commandant's Office in Greece during the Second World War.
In 1945, for the purpose of educating and publicizing the war in support of the Macedonian Bulgarians, the new Greek authorities included Ivan Duychev in a list of Bulgarian, Italian, and German military and other individuals to be tried in Athens as war criminals.
Duichev is accused in particular of "the theft and removal of Greek cultural values from Greece to Bulgaria", such as the Greek authorities' interpretation of the Bulgarian cultural heritage on the territory of Greece, and in particular in Aegean Macedonia, which Duichev saved from plunder.