27. len blavatniK
$17.9 billion Self-made Score: ( Source: diversiFied age: 61 reSidence: london PhilanthroPy score: Blavatnik, a U.S. citizen, was not among the 7 Russian oligarchs sanctioned by the Trump administration in April, but 2 of his partners, Viktor Vekselberg and Oleg Deripaska, were. The 3 are investors in UC Rusal, one of the world’s largest aluminum producers; its stock has fallen almost 60% since the sanctions. Blavatnik immigrated to the U.S. in 1978 to get a computer science degree at Columbia. He made billions in 2013 selling his stake in Russian oil company TNK-BP. His largest assets today include Warner Music and an 18% stake in chemicals giant LyondellBasell. Through his foundation, he says he has given $500 million to charity. Among his gifts in 2018: $10 million to Columbia and $10 million pledged to Stanford.