R. Douglas Fields, a neurobiologist in his 50s, won’t hesitate to lock a pickpocket into a deadly chokehold in the middle of the street. He’s done it before.
Fields isn’t a badass, crime-fighting martial artist whose cover is his day job in the lab — he’s just like everyone else. But when his wallet was snatched while traveling in Barcelona with his 17-year-old daughter in 2010, you could say he just, well, snapped. He didn’t have time to think. He jumped into action.
He got his wa