Can my credit be affected if I am an authorized user on someone's credit card in another country?

My uncle in Europe has offered to add me to his credit card as an authorized user (not co-signer or joint user) to help me pay for some school expenses -- which is really generous of him -- however, I know he is working through some identity theft issues and has less than perfect credit. Will his credit affect mine? If ID theft is still an issue, could I somehow wind up stuck with the balance on his card if he defaults or something? I don't know much about credit cards.