William Henry Jackson (April 4, 1843 – June 30, 1942) was an American photographer, Civil War veteran, painter, and an explorer famous for his images of the American West. He was a great-great nephew of Samuel Wilson, the progenitor of America's national symbol Uncle Sam. He was the great-grandfather of cartoonist Bill Griffith, creator of Zippy the Pinhead comics. Source: Wikipedia (en)