It seems that in order to create an immersive world on the original playstation and keep up the speed of development, iteration and dynamism required for a game he wrote his own compiler (into assembly for the playstation one) for a lisp that he created called Game Oriented Object Lisp (GOOL)[1].
[0] http://all-things-andy-gavin.com/2011/02/02/making-crash-ban...
[1] http://all-things-andy-gavin.com/video-games/making-crash/
[2] http://all-things-andy-gavin.com/2011/03/12/making-crash-ban...
He is going to be forced to add javascript by whiners anyway, I am enjoying the pipe dream of keeping it away.
Well Javascript is Javascript because of some guy personal prefences at Netscape. The same is true for C# and Java in their respective companies, and they didn't start as popular languages either.
A large AAA studio I worked at actually rolled their own scripting language, compiler, and VM from scratch. I got to get my hands dirty with this. The only time since University I've had to utilise my compilers knowledge :)
Unity gives you the choice of C#, a JavaScript dialect, or a Python dialect.
Why not lisp? :D