20. Jamie Dimon

Title: Chairman and CEO, JPMorgan Chase

Country: US

Age: 59

For a decade now Dimon has helmed JPMorgan Chase, the largest commercial bank in the US with $2.6 trillion in assets, and during his tenure he’s become one of the most respected voices in finance. His performance has also made him one of the few bank CEOs to become a billionaire.

Dimon attained Wall Street rock-star status after the financial crisis. No major bank weathered the collapse as well as JPMorgan did under Dimon's guidance, earning him praise for the company’s “fortress balance sheet” and ability to make a profit amid the downturn. But his reputation took a hit in 2012 with the more than $6 billion loss incurred by the London Whale trading scandal, which resulted in stiff fines and a slew of lawsuits, some still ongoing. JPMorgan remains exceptionally profitable though, reporting record earnings of $21.8 billion in 2014.

He has recovered from a recent bout with throat cancer, and he said in September he’s not planning on retiring anytime soon.