Hello! If you'd like to contact me about anything at all, the best way is through my UCSD email, email@example.com. I usually check it daily.
My CV PDF document also has my phone number but I strongly prefer email 99% of the time.
Otherwise, I'm very active on Twitter and I will probably see a DM immediately.
If you'd like to be particularly obtuse about it then you can leave a comment at the Polar Center contact form and I might see it within a couple weeks. Really, don't do this 🙂