Tony Fadell is at the Grove, a spectacularly beautiful country estate outside of London. The event is Founders Forum: the ultra ­exclusive invite-only tech conference. Prince William is in the house. The guest list is lousy with knights and lesser officers of the Most Excellent Order of the British Empire. Marissa Mayer, the now ex-CEO of Yahoo, and Biz Stone, recently returned to Twitter, are mingling with the other hundred or so invitees. But this is really Fadell’s moment.

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