Chris or Christopher?

I was talking to my sister on the phone today and she suggested I use Christopher instead of Chris when I publish my book. Initially, I thought, Really? I’m only called Christopher when I’m in trouble. (i.e. NEVER!)

On the other hand, I’m reading a Jeffrey Deaver book right now, and I’ve always been a fan of Stephen King. I’m pretty sure Christopher Moore isn’t calledChristopher by his friends–although his web site is chrismoore.com.

I must confess that being called Christopher reminds me of the first time a student called me professor. It’s uncomfortable. I want to look around to make sure I’m the one being addressed.