Personal Collections of Famous Billionaires

Phil Knight

Phil Knight has a very private collection of books. The 81-year-old billionaire kept a library attached to his office in the athletic wear giant's office, according to The New York Times. Knight — who has a net worth of $36.2 billion — only let select employees enter, but before they did, Knight required them to take off their shoes and bow. He told The New York Times that he left his book collection in Nike's Beaverton, Oregon offices after he retired in 2016. "Of course the library still exists," Knight said. "I'm always learning."