Andy’s agent for cartoon work is Gordon Wise at Curtis Brown. You can contact him via this page..
His agent for scriptwriting is Lily Williams at Curtis Brown. You can contact her via this page..
Andy also has a publicly available email where you can contact him directly.
Before you do, please cast your eyes down this FAQ post to see if your question is covered there. If it’s not, get in touch using email@example.com and a link to that is here.