George R. R. Martin eating an ice cream cone. Here's a known photograph of George to compare:
As a side note, it turns out to be really awkward to surreptitiously take a picture of a stranger in a local McDonald's. I had to get Mr Bunches to walk in front of me and act as though I was taking his picture. I shouldn't have felt bad, though: if famous authors don't want us taking their pictures as they eat ice cream cones, they shouldn't have written gritty reboots of Lord of the Rings in the first place.