https://www.inc.com/magazine/201210/eric-schurenberg/how-i-d...
I don't generally like the idea of having personal heroes, but John Bogle would be on the short list.
Also, I appreciated that he was willing to grow, even into his old age, regarding his thinking on asset allocation. For example, his stance on holding an international stock index changed over time (from "unnecessary because most S&P 500 companies are multinational" to "there is some value to allocate a percentage of one's account to a broader international index").
Additionally, he wasn't afraid to completely go or say something against Vanguard after retiring. He stuck to his beliefs and was willing to challenge the company he started (and, albeit, was forced to retire from). For example, he was not supportive of Vanguard's deep foray into ETFs as he viewed them as encouraging short-term trading.
All-in-all, he seemed like a wonderful person and the investment industry (and many other realms) are better because of him.