Francesco Mastalia has traveled the world photographing tribal, religious, spiritual, and indigenous people. His first book Dreads, published by Workman Artisan, is a photo documentary on the history of dreadlocks. The book is now in its eighth printing, and includes an introduction by Pulitzer Prize-winning author Alice Walker. His recent book Organic: Farmers & Chefs of the Hudson Valley published by powerHouse Books is a photo documentary of the Hudson Valley's organic sustainable food movement. The portraits of the farmers and chefs were photographed using the wet plate collodion process, a photographic technique developed in the mid-19th century. Works from Organic are included in the Permanent Collection of the Library of Congress.