Net worth: $1.2 billion
Percentage of country's GDP: ~0.6%
Source of wealth: Hotels, diversified
Al Thani is the founder and chairman of Al Faisal Holding, one of Qatar's largest conglomerates, which owns more than 20 hotels worldwide, including the St. Regis in Washington, DC and Miami, and the W Hotel in London.
His company also holds a majority stake in Aamal, which sells medical supplies and pharmaceuticals and owns real estate in Qatar.