Used to be an avid Tcler in the early noughties, but later moved on to other pursuits. In 2010, he came back briefly to clean up some useless old pages he'd left behind. He thought that one would be his last editing visit, but in 2013 his youngest son chose (on PL's suggestion) to use Tcl/Tk for the GUI of an encrypting messaging application. PL decided then and there to brush up on his Tcling skills*.
Some pages he made during his first stay:
He certainly didn't create the Endekalogue but seems to have been the first one to use the term.
He started his programming career in the 1980s at Volvo Komponenter (currently Volvo Powertrain) where he used AUTOLisp and Pascal, and later (pre-ANSI) C. He stayed with C and C++ for many years (eventually teaching those languages in secondary school) before a brief but passionate fling with various scripting languages, notably Perl. After working far too hard for too many years, the almost effortless nature of Tcl programming came as a great relief, but unfortunately he couldn't find a way to go professional with Tcl**, so it petered out. In 2013, he's working with data extraction/presentation and light systems development, mostly using IBM Cognos Report Studio and VBA for Excel/Access (he can't choose his tools at his current workplace).
*) "Get a string for a file name consisting of a time stamp? Um, I think you need a command called... 'clock'. *does web search* Yeah, that's it."
**) And to be honest, he was being a bit lax with Tcl use. It shows in places if you look at his code on this wiki.