In the olympics section, it mentions him as being one of the few "Chinese ..."  

He's American. Nothing else. His nationality is American. You guys are debating his ethnicity. 

My understanding is that he's "外生人“ －but his parents are from Taiwan while his grandparents are from China.  I'm really not sure what the debate here is about. He's American. Honestly, their all Chinese American. People that are debating on whether someone is taiwanese american really need to drop the debate. It's in nobody's interest for Taiwan to be completely independent and even the ROC politicians know that. Drop the Taiwan / Chinese debate please.