Danish-born Jacob Riis (1849-1914) was a journalist, social reformer, and social documentary photographer. He is best known for his 1890 book How the Other Half Lives, which brought public attention to New York's squalid housing, sweatshops, bars, and alleys. The Museum holds the complete collection that Riis used in his writing and lecturing career, including images he made, commissioned, or acquired. These depict men, women, and children of all nationalities at home, work, and leisure. This collection contains vintage prints, glass-plate negatives, and lantern slides, as well as a set of recently produced prints from all of Riis's original negatives.