Personally they have known each other for an astounding 19 years!! Christian started working on GeoDict in 2004 during his master in Computer Science, but left to complete his PhD. After returning to Kaiserslautern, he joined Math2Market in 2012. He is one of those who knows the GeoDict software in-and-out and has decidedly contributed to make it the indispensable simulation software that it is today. 

Congratulations from the whole Math2Market team!