He graduated from the Ludwig Maximilian University of Munich in 1970.
In 1977, he founded the RM Creative Fernseh- und Film-GmbH[1][2] in Munich, which still exists today.
In 1978, he founded the RM Arts Fernseh- und Film GmbH,[3] which later passed to the Kirch Group and since 2005 has rights to some 900 productions owned by the Arthaus Musik label.
In 1981, RM Arts started the series 1000 Meisterwerke for the WDR under the direction of Moritz.
Moritz knew Dmitri Shostakovich and produced the documentary Ein Mann mit vielen Gesichtern ("A man with many faces") about him.