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Jackson, Hartley Harrad Thompson (19 May 1881–20 September 1976), mammalogist and government official, was born in Milton, Wisconsin, the son of Harrad Jackson and Mary Thompson, English immigrants who settled in that state, and the only one of their eight children who was born in the United States. Educated in the local schools, he developed an interest in birds and later in mammals, the latter of which would become the focus of his lifelong research. He soon began a personal collection of study skins. At the age of fourteen he met Ludwig Kumlien, a prominent Wisconsin naturalist and Arctic explorer, who gave Jackson useful guidance in his natural history pursuits. His first article, on screech owls, was published in ...