Without giving away any "state secrets" how do you do this without lighting, flash or reflectors? Your work has a consistency that seems to be beyond the reach of most photographers in your line of work.
Do you shoot in all sorts of conditions from the harshest day to completely overcast?
Do you do any in-camera processing, such as D-Lighting or Canons equivalant to this feature?
Any post processing to help achieve the look or is it all in-camera?
You haven't, by design, ever read a book called "The Natural Light Project" have you?
Just wondering...