Since former Treasury Secretary Tim Geithner is headed to private equity firm Warburg Pincus, it's time to take a little dive into the firm's history and what it's been up to.

Awesomely, this story will include Nazi interrogations, Jordanian royalty, and some pretty hefty deals.

Warburg Pincus was founded in 1966 when founders Eric Warburg and Lionel Pincus merged their two private equity firms. Now it operates all over the world with $35 billion in assets under management and stakes in 125 companies.