Danish-American writer, photographer, and activist (1849–1914) best known for his work in exposing and improving the squalid conditions endured by the poor in New York City. His pioneering 1891 photojournalistic volume, How the Other Half Lives, remains a touchstone in the history of both urban photography and social reform. ALS, one page, 8.5 x 5.25, The Jacob A. Riis Neighborhood Settlement letterhead, April 26. Letter to an unidentified lady. In part: “I thank you for calling me friend and I am proud of the name, bestowed by a woman who thinks for herself and for her fellows…As to your suggestion of a ‘play-room’ in every apartment-house, there are such here and there I have been told. I agree with you that there should be one, as large and airy as possible, in every apartment or tenement, for just the use you would put them to. Many years ago Felix Adler demanded ‘play-rooms’ for the children before even playgrounds were heard of.” Two vertical folds, some light creases and wrinkles, and uniform toning, otherwise fine condition. A scarce offering with direct reference to his idea of ‘model tenements.’ RR Auction COA.