We would like to warmly invite you to attend a special colloquium taking place on February 2. The colloquium is centered around the work of one of our finest colleagues, Wolfgang Lefèvre. It is our honor to celebrate Wolfgang's birthday on this occasion. Among the speakers, just to name a few, are Pamela Long, Andreas Arndt, Peter McLaughlin, Pietro Omodeo, Hans-Jörg Rheinberger, and Matteo Valleriani.