In the 1960s, Paul Baran, a Polish American (from Grodno, now Belarus), along with Welshman, Donald Davies, worked on packet switching which enabled networking and, eventually, the internet.
If it hadn't been for them, quite possibly fellow Brit, Tim Berners-Lee, wouldn't have got the first parts of the web running when he did in 1989.
Paul Baran was born in Grodno, Second Polish Republic (now part of Belarus) on April 29, 1926. He was the youngest of three children in a Jewish family, with the Yiddish given name "Pesach". His family moved to the United States on May 11, 1928, settling in Boston and later in Philadelphia, where his father, Morris "Moshe" Baran (1884-1979), opened a grocery store. en.wikipedia.org/wiki/Paul_Baran
I did a search in the archive and couldn't find this, so it's been posted for the sake of reference.