Early 1900's muckraking writer/photographer who exposed social and political evils in the U.S. He was dedicated to using his photographic talents to help the less fortunate in New York. His photography helped capture the hardships faced by the poor. His most popular work, How the Other Half Lives, became a pivotal work that precipitated much needed reforms in the slums of New York. Jacob Riis's photography, taken up to help him document the plight of the poor, made him an important figure in the history of documentary photography.