You know him. A good friend.
Do you know he has a middle name?
I won’t tell you, though. It’s a secret.
It’s not listed in the index of The TeXbook, I’m afraid.
I will give you a hint: it starts with P.
P as in passionate about TeX and friends.
P as in patient, able to wait, to listen.
P as in peaceful, calm. And always eager to help.
P as in playful, pleasantly humorous.
P as in polite. A gentleman.
P as in proficient, skilled at TeX and friends.
P as in prominent, a true TeX demigod.
P as in proper, correct.
P as in poetic when writing code.
P as in David, David P. Carlisle.
Congrats, my friend.