Karl "Charlie" Steinberg (born 15 April 1952) is a German businessman best known for being the co-founder of Steinberg Media Technologies in 1983 with Manfred Rürup. Their tools helped to make digital audio editing popular, most notably through the Cubase program. Together with Manfred Rürup, they also co-founded the now-discontinued online service digitalmusician.net. Steinberg is also a founding member of the Fun and Mercy charity. He lives in Hamburg with his wife and two children.