Just a short description of my professional activities and background (I felt obliged having participated on the newsgroup and the Wiki after several months):

   * By education I am a physical engineer (a title not well known in Anglosaxon countries, but that is the translation from the Dutch).

   * I have been working at WL | Delft Hydraulics for a good many years now, first as a project engineer working on water quality modelling, later on as a computer scientist (well, sort of), working on user-interfaces and tools for our consulting activities. 

   * I "discovered" Tcl/Tk when reading a famous book by Boris Beizer, and later on my attention was drawn to it again in connection to a testing tool (automated GUI testing). It was simply the tool I had been looking for. For all kinds of purposes: testing, manipulating files, boring stuff that I used to do with UNIX shell scripts or DOS batch files and so on. 

   * My interests: Fortran as a computational language, Tcl as a language for almost anything else and even a bit of numerics if I can manage it, testing techniques (although I should listen to my own advocacy at times :-).