Ivan Nimczuk was born on 12 February 1891 in Galicia and attended Lviv University as a student. He then worked as a journalist for Ukrainian-language newspapers in Galicia and Austria before returning to Lviv and working as the editor of Ukrainian daily newspaper Dilo from 1925 until the Soviet occupation of Galicia in 1939. Nimczuk was arrested by the Soviets and held at Lubyanka Prison in Moscow until 1941, at which point he returned to Lviv and worked as a correspondent for the Krakow-based Ukrainian newspaper Krakivs’ki visti. In 1944 he fled the Soviet advance into Galicia and became a displaced person in the western occupied zone of Germany after the Second World War.

In 1948, Nimczuk emigrated to Canada and settled in Edmonton, AB where he worked as an editor for Ukrainian newspapers and remained active in the Ukrainian Canadian community.

Ivan Nimczuk died in Edmonton on 1 May 1956.