Sam Abell has been a photographer for over 40 years and has been largely known for his work with National Geographic. His career has revolved largely through his many long-term projects for magazines and books. He is also an author, artist and teacher. 
He has published several books including The Photographic Life, Seeing Gardens and The Life of a Photograph which provide wonderful collections of his body of work. 
Sam's ability to compose layered compositions have helped him to create images that are considered some of the best photographs ever made. He shares his insights in his workshops through the Julia Dean Photographic Workshops and the Santa Fe Photographic Workshops. 
http://samabell-thephotographiclife.com/
http://www.magnumphotos.com/C.aspx?VP3=CMS3&VF=MAGO31_10_VForm&ERID=24KL53Y_H
www.thecandidframe.com
www.ibarionex.net