<p>Basically everything that happysunnyshine said. </p>
<p>Also, you might want to contact a number of professors who might be conducting research in your area of interest just because some of professors are inaccessible through email, etc. Maybe call them - although it might too upfront? But it worked for me.</p>
<p>Definitely, have a few questions about his research or past publications. I recently landed myself an internship with a professor/future mentor (haha, 3 days ago) - the interview was kinda informal in the sense, he expected a lot of questions from me and my particular interests. This draws me to point another thing: be clear and specific in your interests - once again, the concern that my mentor had was that I was ambiguous in my writing about my particular interests. (because I was clearly desperate for one - so I was channeling everything)</p>
<p>Don’t be too intimidated (even though, I was a mess when I was being interviewed). Show that you are intellectually curious. Not all mentors/professors are intimidating (and thankfully, mine wasn’t - he was really nice and friendly.)</p>
<p>Either way, I wish you luck! I hope it works out - I’m excited for this summer.</p>