An audacious project to build a vast oil refinery in Nigeria could be the crowning achievement of African tycoon Aliko Dangote’s already impressive CV, reports Jane Lewis.

When leisure tycoon Trevor Hemmings lost a large chunk of money in the 2008 banking bail out, he joined the shareholders’ fight for compensation. A decade later, he’s still going. Jane Lewis reports.

Alexis Tsipras, who leads the far-left Syriza party, took part in school sit-ins and named his son after Che Guevara. Then he morphed into a pragmatist who kept Greece in the euro. Jane Lewis reports.

Mike Ashley, the billionaire bruiser who founded Sports Direct, is gradually taking his brand upmarket. His track record suggests we shouldn’t dismiss his chances of reviving House of Fraser. Jane Lewis reports.

Patrick Soon-Shiong made a $9bn fortune in biotechnology. Now he wants to spend it curing a very different kind of disease – the spread of bad journalism. Jane Lewis reports.

The death of Sergio Marchionne, the “saviour” of Fiat and Chrysler, leaves a massive gap in the leadership of the global car industry, reports Jane Lewis.

A self-made businesswoman, or just famous for being famous? Either way, Kylie Jenner is on track to become the youngest billionaire on record. Jane Lewis reports.

James Benamor escaped a troubled childhood and survived the 2008 financial crisis. Now he has carved out a profitable niche in a controversial industry. Jane Lewis reports.

Over 50 years and more than 1,500 deals, Stefano Pessina turned a struggling family firm into an international healthcare giant. What’s his next target? Jane Lewis reports.

Atul Gawande doesn’t have the sort of CV you’d expect for someone running a healthcare joint venture between Amazon, Berkshire Hathaway and JPMorgan. That’s exactly why he was chosen. Jane Lewis reports.