Thanks, Amy. The nationality question is one that always interests me, and as Hugh and others have pointed out, it is never easily answered. Witness the debate over Mannock, McCudden (although I have never figured out why), etc.
One of my favourites, aside from my never-ending battle to get Harold Hartney placed on the Canadian list, is Emile Lussier. Born in the US to Canadian parents; moved back to Canada as a youngster; joined up here; never considered himself to be an American ace until according to Over The Front he was informed by US authorities after the war; lived most of his life in the US; served in the RCAF in WW2; and, finally, in a letter to StewartTaylor, specifically requested that he be included in his history (sadly never written) of Canadian aces!
Just to balance things out, I find no reason for Camille Lagesse to be included on the Canadian list. I have never found any connection to Canada for him.