> But the craziest thing I did was create a new programming language – with Lisp syntax – for coding all of the gameplay. It had all sorts of built in state machine support (very useful with game objects), powerful macros, dynamic loading etc. It was also highly irregular and idiosyncratic, and in true Naughty Dog fashion “powerful but complicated.”

As for how he works these days, I see in the About page:

> Briefly in 2008, and then full time from the second half of 2009 on, Andy has been concentrating on novel writing.

https://all-things-andy-gavin.com/writing/