Dr Diamadis has lectured and written extensively on the fates of the indigenous Assyrian, Armenian and Hellenic peoples of Anatolia and Mesopotamia (modern Turkey and Iraq), and their connections to Australia.
This extends into other aspects of Genocide Studies such as the Jewish Shoah, forced child removal, and ethnic cleansing.
His work focuses on the ANZAC relationship, as illustrated in his ground-breaking 2002 paper "Precious and Honoured Guests of the Ottoman Government", he explored long-forgotten eyewitness accounts of Australian and other allied prisoners-of-war. Eyewitnesses to the genocide the indigenous Christian peoples of the Middle East were subjected to during and after World War One.
Another long-neglected chapter of Australian military history Dr Diamadis’ work has brought back into the light is the story of the Dunsterforce. This Commonwealth unit included Australian servicemen who risked their lives to rescue 40,000 Assyrian and Armenian refugees from the Ottoman Turkish invasion of the Urmia region in the summer of 1918.
2014 St George Community Service Award; 2001 Centenary of Federation Medal