I've seen effect used by a number of photographers and although I'm not sure I like it, I'm interested in understanding how it was achieved.
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As dpollitt suggests, this photographer has overcooked the local contrast in the midtones of their image. In Adobe speak, this is what the "clarity" slider achieves in Lightroom/Photoshop, and in more generic terms it is what you get if you apply a high pass filter to an image and perform low radius sharpening.
Here's an image I sourced through googling for "portrait" with zero, middling and maximum levels of clarity applied in Lightroom:
These are both higher than I would personally choose to boost local contrast, but this sort of look (often achieved with appropriate lighting as well as darkroom techniques) is certainly a popular one at the moment.