Stefan von Holtzbrinck, co-owner (50%) of the Georg von Holtzbrinck publishing group, which was founded by his father, and its managing director. He is one of Germany's wealthiest publishers and holds a seat on the board of trustees of the Max Planck Foundation, which he initiated, and is an honorary senator of the Max Planck Society. Stefan von Holtzbrinck is the half-brother of Dieter von Holtzbrinck. The other 50% of the company was inherited by their half-sister Monika Schoeller's only daughter, Christiane Schoeller, after her death.