Duško Popov https://en.wikipedia.org/wiki/Du%C5%A1ko_Popov

i've been to the town where he was born and the mother of a guy i worked with in serbia is from there, Titel it's called, about 50km east of Novi Sad, on the Tisa river just before it joins the Danube. hah. There was russian workers swarming the town square when i visited, i forget for what, maybe gas, was circa 2019.