Meet one of Wall Street’s most powerful and closely watched regulators — for the moment.

FHFA chief Mark Calabria’s decisions could rock a $5 trillion mortgage market and make a lot of money for hedge funds. Writing in Bloomberg Businessweek, finance reporter Elizabeth Dexheimer interviews him.

Bloomberg Businessweek helps leaders stay ahead with insights and in-depth analysis on the people, companies, events, and trends shaping today's market.

How do you solve a problem like Fannie and Freddie?

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