Daniel Hans Erwin Zimmermann (born 30 October 1966 in Nürnberg, Germany) is a retired heavy metal drummer. Dan is best known as having been the drummer of German power metal bands Gamma Ray and Freedom Call from 1997 to 2012. He was a founding member of Freedom Call, from which he departed in 2010. Two years later he also left Gamma Ray, announcing a rest from the music business in 2012.