Enlarge / Brian Kernighan speaking at a tribute to his Bell Labs coworker and The C Programming Language co-author Dennis Ritchie in 2012. Ritchie's visage in dominoes is behind Kernighan. A Princeton professor, finding a little time for himself in the summer academic lull, emailed an old friend a couple months ago. Brian Kernighan said hello, asked how their US visit was going, and dropped off hu