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Yeah, Kernighan is the K in K&R as in the other author of "The C Programming Language" as well as the "K" in awk, he's not just some dude speculating.

David Brailsford is an absolute gem, he speaks at length on Numberphile and Computerphile on YouTube: https://youtube.com/playlist?list=PLUTypj9XuPp4YBaHucPvr-zis...

He has a video about Dennis' thesis here: https://youtu.be/82TxNejKsng

IMHO, he's the David Attenborough of Computer History.

And the third one is his younger brother.