Jacob August Riis (; May 3, 1849 – May 26, 1914) was a Danish-American social reformer, "muckraking" journalist and social documentary photographer. He contributed significantly to the cause of urban reform in 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. He endorsed the implementation of "model tenements" in New York with the help of humanitarian Lawrence Veiller. Additionally, as one of the most famous proponents of the newly practicable casual photography, he is considered one of the fathers of photography due to his very early adoption of flash in photography.