Mary Ellen Mark, voted by the readers of American Photo as the most influential woman photographer of all time, has made some of America's most iconic images in a career spanning more than three decades. In Twins, Mark turns her eye and her heart to the extraordinary bond that exists between these very special siblings. For two years in a row, she set up a studio on the site of America's premier twins festival and invited participants to be photographed. Using a twenty-by-twenty-four-inch Polaroid camera, Mark created an extraordinary body of work-a collection of sometimes beautiful, often unsettling images-that reveals subtle nuances in the relationships of the twins she observed. Gorgeously printed in tritone, the book replicates the stellar quality of her large-format photographs in a fitting tribute to one of America's preeminent photographers. Mary Ellen Mark's photographs have appeared in Life, The New York Times Magazine, The New Yorker, Rolling Stone, Vogue, Us, and The Sunday Times Magazine of London.