William Brewster (1851-1919) was a renowned American amateur ornithologist, first president of the Massachusetts Audubon Society, and a president of the American Ornithologists’ Union. He was an avid collector of birds and their nests and eggs, and collected over forty thousand specimens from 1861 until his death in 1919. His collection, bequeathed to the Museum of Comparative Zoology at Harvard University, is considered one of the finest private collections of North American birds ever assembled. Though Brewster collected throughout North America, his collection is especially comprehensive in its coverage of the birds of New England. Brewster thoroughly documented his collecting trips.