Nigel Travis has run Dunkin’ Donuts and Baskin-Robbins as CEO of Dunkin’ Brands since 2009. And he’s as surprised as the rest of us at the resurgence of doughnuts. In this interview, Travis talks about how his background in human resources makes him a better CEO, why it’s so difficult to find employees these days, and the No. 1 thing people like to buy with their doughnut (the answer will probably surprise you).