In March of this year, Meredith Whittaker was at her kitchen table in Paris when Signal, the encrypted messaging service she runs, suddenly became an international headline. In fact, Signal’s user numbers grew by leaps and bounds, both in the US and around the world. KATIE DRUMMOND: Meredith Whittaker, welcome to The Big Interview. MEREDITH WHITTAKER: Nice to see you, Katie. Interestingly, we don't know a lot about the early life of Meredith, which I realize is on purpose.