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Jacob August Riis (May 3, 1849 – May 26, 1914) was a Danish-American journalist and documentary photographer and 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. Jacob A. Riis arrived in New York in 1870. As the economy slowed, the Danish-American photographer found himself among the many other immigrants in the area whose daily life consisted of joblessness, hunger, homelessness, and thoughts of suicide. So when he finally found work as a police reporter in 1877, he made it his mission to reveal the crime and poverty of New York City’s East Side slum district to the world. While living in New York, Riis experienced poverty and became a police reporter writing about the quality of life in the slums. He attempted to alleviate the bad living conditions of poor people by exposing their living conditions to the middle and upper classes. His book, How the Other Half Lives: Studies Among the Tenements of New York, was published in 1890, and is still considered “a landmark in the annals of social reform.”