The Masters of Photography category is devoted to sites which support the study of, or provide access to, the art and history of acknowledged masters. A Master Photographer is one who, having had an impact upon the practice of photography through his or her work, has established a widely recognized place within the history of photography. A strong sales record or a long list of exhibitions and publications is not enough to qualify a photographer as a master. He or she must also be recognized by major museums, usually through the presentation of retrospective exhibitions, and his or her contribution to the field acknowledged by major historians of photography.