Ralph Stock, born in 1969, and is seen as one of the first professional developers of commercially sold computer games in Germany and Europe. His debut, »Der Stein der Weisen« (1984; tr. The Philospher’s Stone), was a great commercial success, which he was also able to repeat with »Mad TV« (1991) and the »Emergency« games series (since 1998) and other games. Stock and his company Serious Games Solutions has also developed solutions for game-based learning (among others for Siemens). He lives in Tübingen and Potsdam.