It doesn't matter what his ethnicity is. Only his residency status. Even if he's not a US born citizen but living there with a green card, he has already declared his allegiance to the Americas region. For example, even though Russ on GE is a UK citizen with a UK passport, because he used his indian overseas residency(green card kinda) to join GE as a non-import his allegiance is with Pacific region, if he goes back to EMEA and joins an EMEA team he will now be counted as an import even though he is literally a UK citizen