He is reading Ancillary Justice, by Ann Leckie, which he got at Borderlands bookstore next to the park.
I am posting this over a month after taking this picture because I got caught up with getting married, and then I sprained my wrist. So, as a result, I'm looking at my notes about our interview jammed beneath notes on ice estimates, emailing students, and what to text relatives, and all I see is an author's name: Patrick Rutherford, and I'm not sure who this author is or what he means to the reader.
That's all. I'm back to posting again, though!