Leon Black built most of his fortune by rising to lead mergers and acquisitions at Drexel Burnham Lambert and then cofounding Apollo Global Management in 1990, where private-equity performance and a large retained founder stake became the main drivers of billionaire-scale wealth. [1][2]
Drexel experience and family advantages preceded Apollo
Black came from a financially prominent family and attended Dartmouth and Harvard Business School before building his career at Drexel Burnham Lambert. He ultimately led the firm's mergers and acquisitions group, gaining deep transaction experience and an unusually strong Wall Street network before becoming a founder. [1]
After Drexel entered bankruptcy in 1990, Black cofounded Apollo with former colleagues including Joshua Harris and Marc Rowan. The new firm applied distressed-debt and buyout expertise to private equity, converting the founders' professional experience into ownership of a scalable investment manager. [1][2]
Apollo expanded across private equity, credit and other alternative assets and later became a public company. Black's founder stake turned part of the private partnership value into observable public equity while management and investment economics continued to compound. [1]
Public equity made the founder wealth mechanism more visible
Forbes reports that Black still owns a significant share of Apollo, while the firm's roughly trillion-dollar asset base belongs principally to clients and investment vehicles. His personal net worth therefore reflects founder equity and investment economics rather than the gross assets Apollo manages. [1]
Black stepped down from Apollo's leadership in 2021 as the firm transitioned to successor management. The change ended his operating control but did not erase the decades of founder value already embedded in his ownership, making Apollo the central financial engine of his fortune. [2][1]
Sources for background
Sources reviewed Sep 19, 2026.
- Leon Black · Forbes · Sep 15, 2026
- Marc Rowan Assumes Role of CEO of Apollo · Apollo Global Management · Mar 22, 2021
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