Currently Interlisp and Common Lisp, mostly under Medley.
What problems do you solve?
I use Lisp for my hobby programming, not necessarily for solving practical problems. I enjoy coding for the intellectual pleasure of creating, exploring algorithms and systems, and learning computing.
Why do you choose Lisp to solve these problems?
I have been checking out several programming languages for the past four decades or so and Lisp is the only family of languages that doesn’t just come the most natural to me, it gives me pure joy.