Childe Hassam(October 17, 1859 – August 27, 1935) was a prominent and prolific American Impressionist painter, noted for his urban and coastal scenes. Along with Mary Cassatt and John Henry Twachtman, Hassam was instrumental in promulgating Impressionism to American collectors, dealers, and the museums. He produced over 3,000 oil paintings, watercolors, etchings, and lithographs in his career, and was a founding member of The Ten, an influential group of American artists of the early 20th century. His most famous works are the “Flag” oil paintings, completed during World War I.

Childe Hassam was born in 1859 near Boston. In 1872 a great fire in Boston destroyed his father’s business, forcing Hassam to leave school. He found a job with a publishing firm, but having little talent for business, he began work as an apprentice to a wood engraver and later created illustrations for such magazines as Harper's and The Century. Between 1877 and 1879, Hassam attended evening classes at the Boston Art Club, studied briefly with William Rimmer at the Lowell Institute, and also took private painting lessons.

At the age of twenty-four, Hassam visited Great Britain and the European Continent for two months. In 1886 he moved to Paris, where he studied at the conservative art school, Académie Julian. Hassam was attracted to French Impressionism, however, and readily absorbed elements of the avant-garde style. Hassam returned to the United States in 1889, moving from Boston to New York. Integrating his understanding of impressionism with his own tendency toward clear compositional structure and forms, he painted many views of the city. Noted for their light impressionist colors, quick brushstrokes, and also their solidity, his city views were well received, and he became known as one of the leading American impressionists. Hassam was able to return to Europe twice between 1897 and 1910, visiting Pont-Aven, where many Post-Impressionists had painted, and, on his last trip, southern Spain. In late 1897, he withdrew from the Society of American Artists and co-founded the Ten American Painters with fellow American Impressionists J. Alden Weir and John Twachtman.

In 1915, influenced in part by the work of his friend Weir, Hassam began experimenting with etching and, two years later, lithography. In 1920, having summered at various seaside resorts since 1882, he established a permanent summer studio in East Hampton, Long Island. During the remaining fifteen years of his life, Hassam continued to exhibit regularly, enjoying national recognition and receiving numerous awards and honors.