In an unusual move given Donald Trump’s criticism of Wall Street, the U.S. President-elect has chosen former Goldman Sachs banker Steve Mnuchin to be the 77th U.S. treasury secretary.

As a key part of Trump’s cabinet, the treasury secretary establishes economic and financial policy for the country. Mnuchin will be tasked with responsibilities like managing the country’s debt, overseeing the IRS, negotiating with global financial ministers and signing the most powerful currency in the world.

Yet, Mnuchin has no experience working in government – so what does he bring to the job? Here’s a look at Mnuchin’s resume and why Trump may have selected him:

MNUCHIN'S GOLDMAN CREDENTIALS 
After graduating from Yale in 1985, Mnuchin followed in his father’s footsteps and became a banker at Goldman Sachs. He became partner nine years later, and was eventually named Goldman’s chief information officer. At Goldman, Mnuchin oversaw trading in government securities and municipal bonds. Mnuchin stayed with the bank for 17 years.

Mnuchin is not the only treasury secretary with Goldman credentials – he will be the third treasury secretary to come from the major investment bank. Other treasury secretaries who served in Goldman’s top ranks include Robert Rubi (who served under Bill Clinton) and Hank Paulson (who was George W. Bush’s treasury secretary).

WOLF ON WALL STREET
After his Goldman career, Mnuchin began managing hedge funds. He worked for two hedge fund managers, Eddie Lampert, his former Yale roommate, and George Soros, the billionaire investor who has become known for funding liberal political causes.

After two years of working for the hedge fund managers, Mnuchin started his own hedge fund, Dune Capital Management — which was financially-backed by Soros.

HE ACQUIRED A FAILED BANK  
During the 2008 financial crisis, Californian bank IndyMac was seized by federal officials. The bank was expected to suffer US$8 billion in losses and become one of the largest bank failures in history.

Yet Mnunchin lined up his Wall Street network of investors, including Soros, to make a bid for the bank. The group bought IndyMac’s failed assets, branches and deposits for US$1.5 billion. After turning the business around, the group renamed it “OneWest Bank,” and sold it in 2015 to CIT Group for US$3.4 billion.

Mnuchin still owns more than one per cent of the bank's shares and sits on the CIT board.

HE'S A HOLLYWOOD FINANCER
Mnuchin’s hedge fund and wealth from OneWest Bank expanded into the entertainment industry. Dune teamed with filmmaker Brett Ratner and Australian investor James Packer to create RatPac-Dune Entertainment. The company produced many 21st Century Fox films, including American Sniper, X-Men and Avatar — the largest grossing box office film ever.

BIG TAX CHANGES COMING?
On Wednesday, Mnuchin told CNBC that he wants to boost U.S. economic growth and jobs through tax reform, saying that his plan includes cutting the corporate tax rate to 15 per cent from 35 per cent. The plan is in line with Trump’s campaign promise to cut taxes and bring jobs back to the U.S.

A TRUMP LOYALIST
In May, Mnuchin worked as finance chairman for Trump’s campaign. Majority of the US$169 fundraised, was after May, when Mnuchin lead the campaign fundraising. Mnuchin is close to Trump’s children and son-in-law, and has worked with them on fundraising events.

Mnuchin and Trump have been friends for more than 15 years and often run in the same elite circles. Mnuchin’s hedge fund has also made investments in Trump’s real estate projects.