Pierre Janet

Pierre Janet was a contemporary of Freud, was trained with him with Charcot. You can read a summary of Janet's work here. If you read French, you're in luck, they are free on line. A search of Amazon.com leads to no books, not even as a key word. Where Freud went on to talk about "double consciousness" Janet came up with "dissociation" which is so useful to us.

I'm reading Judith Herman's Trauma and Recovery. There are pictures and you can read an interview of her here. And here is a book review.