Interviewing an author. What questions to ask?

I'm interviewing a not so well-known author. I don't really know what kind of questions to ask. Any suggestions? He writes books and poems. I only have one:

What made you want to become an author?

I want at least 10.

Update: This isn't for a class. He's an author I've sort of gotten to know and he is wanting to get more people interested. I used to write for a teen paper. I suggested I write an article on him and he thought it was a great idea.
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