Chisholm, who made the jaw-dropping offer to buy the team, is the managing partner and chief investment officer at Symphony Technology Group – a private equity firm based in California. He grew up on the North Shore and is a die-hard Celtics fan who's paying a whopping $6.1 billion for the team.

The Boston Celtics just became the most expensive North American sports franchise ever sold at $6.1 billion—a nearly 1,600% increase from their 2002 sale price. As sports franchise values soar, experts warn fans could soon feel the impact through higher ticket prices,