He is more recently known for developing many highly-acclaimed strategy games, such as Agricola and A Feast for Odin.
Born in Aurich, Germany, Rosenberg first began to occupy himself with the development and mechanisms of games at the age of 12.
Since finishing his statistics studies in Dortmund (the subject of his thesis was "Probability distributions in Memory"), his main occupation is the development of games.
It published a number of expansions to Bohnanza, partly in cooperation with Hanno Girke.
It dethroned Puerto Rico as the highest rated game on BoardGameGeek.com in September 2008 and remained there until March 2010.