Jacob Riis
Jacob August Riis was a Danish-American social reformer, "muck-raking" journalist, and social documentary photographer. He contributed significantly to the cause of urban reform in the United States of America at the turn of the twentieth century. He is known for using his photographic and journalistic talents to help the impoverished in New York City; those impoverished New Yorkers were the subject of most of his prolific writings and photography.