[3][4] His scholarly work included writing, editing and archival work in Ukrainian, English and other languages, as well as taking on several editorial roles, including on a history of Russian imperialism, where he argued that the Russian colonizing empire "from the 16th century onward resembled the great colonizing empires of Portugal, Spain and Britain".

[4][5] Four centuries on, he describes Stalin and his followers as "buil[ding] their empire on 'the bones of millions of innocent victims'" during the Great Ukrainian Famine (Ukr: Holodomor).

[6] In 1985, Hunczak also became editor in chief of Sučasnist (Eng: the Modernist), a "monthly journal of literature, translation, the arts, history, and political, social, and economic affairs, published from 1961 to 1990 by the Suchasnist Ukrainian Society for International Studies in Munich, with the assistance of the Prolog Research Corporation; then in 1990–1991 in Newark, New Jersey; and from 1991 to 2013 in Kyiv.

[9] Hunczak was a member of the National Academy of Sciences of Ukraine (NASU) and the Shevchenko Scientific Society in the U.S., a Ukrainian-American scholarly organization.

In 2014, his nephew Mark Gregory Paslawsky, a West Point graduate, died in Ilovaisk, eastern Ukraine, while fighting with the Donbas Battalion against pro-Russian separatists.