I got an email from the alumni interviewer at one of the colleges I applied to asking to set up a time to meet. My question is, what should I call him? Should I use his first name or call him Mr. Smith (last name changed by the editor)? He signed the email with both his first and last name, so I'm not sure what to do."
Good question, Zack. Stick with "Mr. So-and-so" until he says otherwise. And if you hear from female interviewers, go with "Ms." Nobody has ever been offended by being referred to as Mr. or Ms., and they'll appreciate that you're being respectful.
When and if the interviewer tells you it's OK to use their first name, start doing that. Don't make them tell you twice.