Hello! The best and easiest way to contact me is through my URI email: firstname.lastname@example.org.
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 🙂