Ferdinand Porsche
In 1931, he founded the Porsche GmbH together with Ferdinand Porsche and Dr. Anton Piëch. With Rosenberger's financial backing, Dr. Ferdinand Porsche and Dr. Anton Piëch started the company with some former co-workers including chief designer Karl Rabe. Rosenberger was also instrumental in the creation of the Auto Union concern, being credited with influencing Porsche's choice of a mid-engined design for the Auto Union racing cars.