BBC World Service - Good Bad Billionaire

Peter Thiel: Paypal mafioso

How Peter Thiel made his fortune from huge tech companies then renounced Silicon Valley

How American businesswoman Doris Fisher and her husband founded a clothing empire

Mexican telecom company boss Carlos Slim Helú was once the richest person on Earth

How Russian oligarch Roman Abramovich got rich, then got sanctioned

How Indian multinational conglomerate boss Mukesh Ambani built Asia's biggest fortune

How Patrice Motsepe became the first black billionaire in post-apartheid South Africa

How Jack Ma brought ecommerce to China by creating online mega-platform Alibaba

The founder of sporting apparel firm Patagonia made billions - then gave it all away

How the woman who founded dating apps Bumble and Tinder was briefly a billionaire

Aliko Dangote started a cement business, and went on to become Africa’s richest person