Yes, I interned for one of the richest men in my city for an entire year, I'd see him every day after college. He was one of the best lawyers in the US, was involved in a famous supreme court case where he deregulated a certain industry, began a company in that industry, and then sold that company for $300 million dollars. He retired and was beginning a startup for fun, and I interned with him for this startup.
He told me by age 16 he was able to read 100 pages per hour. I met him every other day, and he had a different book in his hand each time. Coincidentally the Stoics were his favorite. He learned Russian and French just to read Proust, Flaubert, French poetry, Tolstoy, Dostoevsky, etc. in their original prose.
We'd meet for about 2-4 hours every other day, and about half the time was spent him ranting/reminiscing. He'd have a different book with him every time we met. He could knock out 1,000 pages in a day. He had no one else to talk to, his children despised him and his second wife was a gold digging whore. I would ask him questions about the work that I already knew the answer to, but I just wanted to see his thought process. He was a true genius. Like he could seriously be president or something if he wanted, he's one of the most brilliant human beings you'll ever meet.
Some books I saw in his bag when I met with him were Tao Te Ching (he always carried it with him, and would recite entire verses of it to me), Marcus Aurelius and Seneca (same, memorized some quotes/verses), In Search of Lost Time (French version), lots of philosophy books too.
Rant topics would range from academia's incompetence, how the presidency should be abolished entirely because the insane hype and billions of $$$ in protection vastly outweighed the limited power of the president (mind you this man won multiple supreme court cases as a lawyer), simulation theory, how wealth is overrated, and more. But listening to him lay out his thought processes was brilliant, I learned more with him than I did in 4 years of college.