Well, I'll play Devil's Advocate.

Just like a Hacker may make the best Security Officer because they know the tips, tricks, tools and techniques used by hackers to break in, this guy may make the perfect Privacy Czar because of his knowledge.

Doubleclick is notorious for being one of the companies that invades privacy the most so this guy may have significant "inside" knowledge of the tips, tricks, tools and techniques used by companies such as Doubleclick and be able to defend against them better.

Of course, he may also have some sort non-compete clause that prohibits him from using or sharing his inside knowledge for some duration of time.

Just some thoughts.