What a Pulitzer Prize Winning Author Reads on the Train

I have the strange ability to recognize faces, especially of people who interest me, whether famous or not. I often see actors taking public transportation to and from the upper west side. This morning, I spotted Frank McCourt. I liked Angela's Ashes, but I loved 'Tis. I read it just after I moved to New York City. It's a humerous and self-deprecating memoir of Frank's own New York City experience, but it's also a history of the city itself. I still find myself being reminded of things and places that I read about in 'Tis. Hardly a soul on the train is without a book or newspaper to pass their commute time (but not me - it's only five stops and I'm usually too busy staring at faces). So what was a Pulitzer Prize Winner reading? He was reading Saxons, Vikings, and Celts: The Genetic Roots of Britain and Ireland by Sykes. He wears bright blue framed reading glasses.