Michael Dorrell cofounded infrastructure investor Stonepeak in 2011 and remains its chairman and CEO; Forbes values his fortune primarily through his ownership of the private investment firm. [1][2]
Building an infrastructure investment firm
Dorrell spent more than a decade at Macquarie and later worked at Blackstone before cofounding Stonepeak in 2011. Stonepeak says he has been involved in the firm's development since its founding and now directs strategy and investment decisions. [2][1]
That career supplied the experience and relationships that preceded Stonepeak's formation, while the billionaire-scale fortune came from becoming an owner of the new private investment manager rather than remaining solely a salaried infrastructure investor. [2][1]
Ownership and private-market valuation
Stonepeak invests across infrastructure sectors including energy, logistics and digital assets. Forbes reports that a 2023 minority investment by Blue Owl valued the firm at roughly $15 billion, providing an external transaction reference for the value of Dorrell's private-company interest. [1]
Forbes's billionaire estimate depends on its assessment of Dorrell's economic interest in Stonepeak. Stonepeak's leadership page confirms that he is chairman, CEO and cofounder but does not disclose his personal ownership percentage, so the minority transaction is a company-valuation anchor rather than a direct measure of cash or equity personally held by Dorrell. [2][1]
Sources for background
Sources reviewed Sep 15, 2026.
- Michael Dorrell · Forbes · Jul 15, 2026
- Michael Dorrell · Stonepeak
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