Johann Rupert is chairman of Swiss luxury goods firm Compagnie Financiere Richemont.
The company is best known for the brands Cartier and Montblanc.
He owns a 7% stake in diversified investment firm Remgro, which he chairs, as well as 25% of Reinet, an investment holding co. based in Luxembourg.
In recent years, Rupert has been a vocal opponent of plans to allow fracking in the Karoo, a region of South Africa where he owns land.
He also owns part of the Saracens English rugby team and Anthonij Rupert Wines, named after his deceased brother.
Rupert says his biggest regret was not buying half of Gucci when he had the opportunity to do so for just $175 million.