Marianne Lake has been the Chief Financial Officer at JPMorgan Chase & Co In the management shakeup following JPMorgan Chase's $6 billion trading loss in 2012, Lake came out on top, taking the chief finance job at one of the world's biggest financial institutions.

Previously she had been CFO for the company's consumer businesses. Now the U.K.-raised accountant works closely with CEO Jamie Dimon and is one of only two women on the 14-person operating committee at the bank, with $108 billion in revenue. Lake started her career as a chartered accountant at PriceWaterhouseCoopers in their London and Sydney offices.

Lake didn't study at an elite university. She's the child of working class British parents and studied Physics at Britain's Reading University. Lake apparently talks very fast, but only because she thinks very fast. She has an amazing memory for numbers and apparently competes with Dimon to see who can best remember numbers down to the greatest number of decimal points.

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