With barely a minutes effort I dug up his linkedin. 1) There's no indication he's not US born and raised, but you're free to make assumptions based on his name

With barely a minutes effort I dug up his linkedin. 1) There's no indication he's not US born and raised, but you're free to make assumptions based on his name, I guess. 2) Regardless of that he's been working in the US since 1994, which would put him way beyond the maximum limit for an H1B (6 years + possible extension during change of status). So no, it's not some H1B teaching you.