Hey Jim,
Alot of my changes in post processing are with the shadow/highlights feature in photoshop to mess with the tonal contrast a bit. Other than that I dont do a lot of photoshop on them other than cleaning up the backdrops from hair and treat remnants from during the shoot. On all of these shots the lighting set up was a soft box to the left, a reflector to the right a hair lights in a 10x20 gridded softbox for the dark backdrop and obviously just background lights for the white backdrops. The same set up was used for the low key shot on my lab in the other post as well. Take care, Scott