Daniel Grinberg is a UX researcher by day and an international man of mystery by night. He’s based in Philadelphia and has constructed crosswords for venues like the New York Times, USA Today, and the Philadelphia Inquirer. He has a PhD in Film and Media studies, with his dissertation covering topics such as a C.I.A. documentary, “Citizenfour,” and F.B.I. surveillance. His favorite spy media is “The Americans.”