You can contact me by e-mail, telephone, signal messenger - on the same phone number - and matrix chat.

I am mainly based in Central European Time. For calls from outside of Europe far outside of usual business hours, I kindly ask you for a brief coordination via e-mail beforehand.

Please consider encrypting your e-mails. My public PGP key can be found on the PGP Public Key Server of the Massachusetts Institute of Technology (MIT), among other places. Its fingerprint is "0x51d9f0ddd25193f4".