What Was God Doing Before Creating the Universe?

I recently had an opportunity to speak with a very highly respected figure within the philosophical community. He asked me a question that I could not answer:

If the universe is created and God is eternal, then what was God doing before he created the universe?

I’m not sure a satisfactory answer is possible.

How would you answer this? Please note that I will be replying with potential refutations for the sake of development, not to start a debate.