Eakins assisted Muybridge in research he undertook in Philadelphia, and was directly influenced by his approach to photographing human and animal locomotion. Whitman and Eakins had a lot of mutual respect, perhaps grounded in the professional rebuffs both had experienced; Eakins painted and photographed Whitman (a set of images of a naked old man are probably also be of him). Henri studied under him briefly, and after his death, wrote about his honesty and integrity as an artist.