Cass was content anywhere. Whether hanging out in an airport lounge or waiting at the dentist, he needed only his laptop to feel at home. I came to understand why he was one of the most prolific scholars in the world—he used every nook and cranny of the day, no matter where he was, to write. As soon as he had turned on his MacBook Air and pulled up a document on the screen before him, he simply picked up where he had left off ten minutes, an hour, or the day before.

