From hamptons.guestofaguest.com:

Word on the street is Bill and Hillary have been shacking up at Bill's billionaire homeboy Thomas H. Lee's East Hampton abode. During Bill's White House tenure, the Lee was a frequent guest, and now it seems he's returning the favor. So just who is T.H. Lee?

• A wildly successful investment banker and founder of Thomas H. Lee Capital, which owns or has owned Snapple, Playtex, First Alert, and GNC, among others.
• The first citizen of Massachusetts to bequeath over $20 million to a non-profit institution (to his alma-mater and desperately cash-strapped Harvard). Basically, across the board Lee is a huge donor, be it to universities, hospitals, museums, or charities. Google him and you'll see what I mean.