Theo uses GPG to sign and encrypt emails. He also uses OTR to do the same for IM. Below are his key fingerprints for verification. Contact email addresses are available here.

Keybase

https://keybase.io/tbaschak

PGP & OTR fingerprints

gist.github.com/tbaschak/d4fa7e4cfb5e809d477a

PGP Key

pgp.mit.edu:11371/pks/lookup?op=get&search=0xC1ACA463B519C47E