This is a thread for listing names, without any foregone conclusions about what such a list might reveal. The list, here, is those makers who might claim different nationalities based on different parts of their lives. If someone sees some overwhelming generalization, here, that would be interesting. I include a "Verdict on nationality as maker" without any justification for that verdict, maybe just to provoke discussion.
Here's a start at the list of makers whose nationality is international, or perhaps not:
Tschu Ho Lee: Grew up in South Korea. Trained in violin making in Germany. Came into prominence as a maker and a teacher in the United States. Verdict on nationality as maker: American.
Bela Szepessy: Grew up in Hungary. Trained in violin making and made violins in Hungary and Vienna. Made violins for many decades in London. Verdict on nationality as maker: Hungarian. That designation may be just my partiality for giving the small country of Hungary and Hungarians as much credit as possible.
Giuseppe Fiorini: Grew up in Italy. Trained in violin making and made early violins in Italy. Subsequently, established shops and made violins in Munich and Zurich. Subsequent making also in Italy: Verdict: Italian, based on never straying too far geographically from Italy.
Roger Hargrave: Grew up in England. Trained in violin making in England. Established own shop in Germany. Verdict: English.
Matteo Goffriller: Probably born in Tyrol, Austria (per Henley). Prominent maker in classic Italy. Verdict: Italian, as the "founder" of the Venetian school.
George Gemunder Sr: Born and raised in Germany. Trained in France. Became prominent maker in the United States. Verdict: American.