The top org was a 501(c)3 and the directors were all effectively independent. The CEO of such an organisation would never have any control over the board, by design.
We've gotten very used to founders having controlling shareholdings and company boards basically being advisory rather than having a genuine fiduciary responsibility. Companies even go public with Potempkin boards. But this was never "normal" and does not represent good governance. Boards should represent the shareholders, who should be a broader group (especially post-IPO) than the founders.