I believe he is a dual citizen of Hungary and the US.
..and here is all you really need to know about his past and his feelings about it:
http://sweetness-light.com/archive/george-soros-on-helping-the-nazis-during-the-holocaust
Interesting reading, thanks for the link. If you poke around on there it also shows that he’s been heavily funding legalization of drugs since the early 90’s.