5. Lawyer
![Wichai Thongtang Wichai Thongtang](http://c8.dq1.me/uploads/article_block/19343/article_image/42256/thumb_backenduser-14-2017-03-31-09-33-05.jpeg)
Case Study: Wichai Thongtang
Country of Citizenship: Thailand
Net Worth: $1.5 billion (£1.2 billion)
‘I’m low profile but high profit,’ Winchai Thongtan once joked. And it’s completely true: the lawyer-turned investor who represented the former prime minister of Thailand, Thaksin Shinawatra, has been quietly accumulating assets for decades – mostly from his stake in hospital operator Bangkok Dusit.