Leo Greenlees was Scottish? I thought he was Canadian. You may be confusing him with a different Greenlees family.
I didn’t realise Karl Klein was born in Germany
I think Ewart Chitty was English
Martin Poetzinger was German
Wasn't Lloyd Barry Australian? No google says born in New Zealand
Did George Gangas grow up in Greece? His bio says born in the Ottoman Empire, he was that old.
John Barr was Scottish, as mentioned
Geoffrey Jackson is Australian
Gerrit Loesch was born in Austria
And Stephen Lett, a badly kept secret, is from the planet Neptune