Does An Author Write Themselves Into Their Stories?

It's a common question. When an author writes about "what they know", are they writing themselves into their story?

I often use the disclaimer: This is a fictitious work. People, places, and events are fictitious. Any similarity is purely coincidental.

To be cheeky: This is a work of fiction, except for the parts that aren't.

Yet, people still fail to see that disclaimer.

While I was writing One Man's Wife, one of the short stories in Twelve Strokes of Midnight, someone I know read it for me. Par...