I'm not sure if he's mentioned already, or if he's"famous" at all, but I'm a fan of Joey Hess.

Once I saw his name on some of old debian man pages and for no apparent reason, I looked up his name and found his home page.

He was a motivation for me to start learning Haskell, and also I was damn envious of his awesome lifestyle.

See shy jo at https://joeyh.name