I have been known as henx for quite a while. This was my teenage nickname and so it became my first Unix account and email address (firstname.lastname@example.org) in 1995.
Upon joining Twitter in March 2011, I became hmitsch.
Over the past few weeks I have renamed a lot of my online profiles from henx to hmitsch. This is the slow end for a long-time online ID. It’s probably time for that change.