Abell's style is difficult to put into words... wonderful sensitivity to light... graphically rich images with at times profound story-telling content.
He has published a couple of books (that I know of at least) "Stay this Moment" is the only title I recall. Unfortunately it is out of print.
He also runs a class at the Santa Fe Workshops, called "The Next Step" (or words to that effect, which I understand is quite popular.
Frankly, if Sam Abell were to appear in my neck of the woods, I would jump at the chance to hear him speak.
Thanks for the response, englishm.