must be a good book or required reading with a upcoming deadline

I went for a walk in Pease Park around 6ish last night. There was a tall, athletic man carrying a book and reading as he walked. He seemed very serene, pausing every now and then to look around him and then dropping his eyes back to the pages. He did not seem like someone who would be reading a thick novel as he walked in a dog park. He was not even dressed for walking in a park period. He wore a white undershirt, black slacks, shiny black shoes and a black leather brief case slung over one shoulder. I bet the briefcase contained his suitjacket and button up shirt.