Until Michael Rees became a billionaire this year, he was arguably the most popular man on Wall Street.
Like other successful financiers, Rees works in private equity, an industry with $3tn in unspent capital and a seemingly insatiable appetite for buying houses and hospitals, theme parks and prison payphone systems, genealogy websites and just about anything else that generates cash.
But unlike most of his peers, Rees makes money by buying pieces of the financial industry itself. He has won the trust of dozens of executives, who sold him shares in the closely held investment firms that underpin their personal wealth and have become the most powerful institutions on Wall Street.