The author of this, David Beazley, was a professor of mine for two courses as an undergrad at UChicago. He taught Networking and Operating Systems and was one of the top 3 professors in the CS department. He left teaching for a while, but it looks like he's back now, which is extremely encouraging for all CS students!

If anyone has the chance to listen to him speak or teach, I highly recommend it. (Also, if anyone has the chance to see him perform jazz music, I highly recommend that, too!)