With a background in risk, Nick Kokonas started writing contingency plans early. Then he wrote a letter furloughing hundreds of employees and cried before taking aggressive measures to attack an unprecedented set of problems. Hear how Kokonas, the CEO and founder of Tock, and owner of five Chicago restaurants including Alinea, is reinventing operations--both physical and digital--to meet the moment for his own staff and for hundreds of restaurants around the world