I live in Australia, I can't see him. He could be an Australian with an American accent, which is fine. But I assure you that's not an Australian "accent" - which I never knew existed until last week. To me Australian "accents" just sound normal.I think that the guy is Australian and the girl is American in these videos, but I'm not 100% certain.
Laughing Librarian 1
Laughing Librarian 2