As has been said, it is a pretty basic setup utilizing two fairly symmetrical light sources placed to each side and sometimes towards the back of the
subject.
In studio he has used profots strip lights with a front high fill to balance the contrast
Do a search for the photographer, Martin Schoeller, and you'll see that this has been his signature look for some time and has brought him
a fair amount of fame within the industry.
Here is a video of him shooting in studio for lighting reference
http://www.youtube.com/watch?v=8ZTGXhWjAf4Usually he has combined the lighting style with an 8 x 10 film capture which gives an extremely detailed image.
Don't know if he has transitioned to digital capture yet.
Mark
www.marktomalty.com