You can email me at bart@gellman .us. That's for individual correspondence only. Please do not put me on any kind of mailing list.
For most people, the best way to get in touch is by sending a message on Signal to 609-258-5306. (The same number works with WhatsApp.) I do not use this number for telephone calls. Text and documents only, please.
Other ways to get in touch privately, including SecureDrop and PGP, are described on my Secure Contacts page.
To request an interview, book a speech or invite me to participate in a public event, please write to Colleen McGarvey at Penguin Press: email@example.com.