Walle works at the Universiteit of Antwerp. We met each other through our student union. I lived together with Walle for one year when I was in my final year at the University of Brussels. Walle was my best man at our wedding.
You can find Walle's web site at http://walter.schreppers.com.
See also: Nerd Heroes, Dale and Eva, Manu and Adinda.