We are retrired Mathematicians (probability, statistics and topology of manifods) and IT Professionals. Elisabeth is a coauthor of some papers about computer supported truck parking and of the book "Modellbildung und Analyse von Rechensystemen" (english: Modeling and Analysis of Data Processing Systems). Wojtek has Ph.D in Mathematics and was almost 30 years an IT-Professional (among other things a Software Architect of the DHL Packstation). We have three adult children (Philosopher/Academic Manager, Mathematician, Neurologist) and three lovely grandchildren with whom we spend some nice times on vacations. Chess and bridge are family hobbies, the sons still play some chess team competitions. We like to hike and to travel.