A new interview with yours truely is posted on Hank’s Two Fisted Blog, worth a look in my highly biased opinion! Here is a small bit from it:
2FB: So tell us about Deckard: What would his resume read like? More importantly, how would you describe his personality, motivations, etc.? Assuming he has time off in between jobs, how does he like to spend it and where does he go?
As far as his professional and personal background, I leave that fairly murky. This was done intentionally in order to reveal a little more about him with each book. I hope it doesn’t tick readers off but I think it is interesting to develop a character over the course of several books, revealing more about him within the plot of each novel. However, even in Reflexive Fire we learn a little bit more about him as we get deeper into the book.
In terms of motivation, well, if there is any doubt in the reader’s mind by the end of the book, Deckard’s final words in the novel will leave no doubt as to why he does what he does.