Stefan Quandt owns 23.6% of automaker BMW; his sister, Susanne Klatten, the richest woman in Germany, owns 19.1%. Their late mother, Johanna, was the third wife of legendary industrialist Herbert Quandt, who guided BMW to preeminence in the luxury market. Both siblings serve on BMW's supervisory board; Quandt is deputy chairman. His holdings also include Heel (homeopathic medicine), Entrust (digital identity and data security) and Logwin (logistics). He graduated from the Technical University of Karlsruhe, where he studied economics and engineering.
