You can contact me by email using the address firstname.lastname@example.org, which is also linked in the left sidebar and at the bottom of all pages of this website.
By encrypted message
From my profile page on the Keybase online identity registry, you can encrypt a message so that I will be the only one able to read it; simply send me the result by email.
If you already use OpenPGP, you can also get my public key via Keybase or via your usual key server. This key's fingerprint is:
1165 F244 2867 A9F8 235D 820C 4F47 532A 23EA 94D3