"Henry David Thoreau (1817-1862) was one of America's most influential thinkers, a naturalist who travelled and lived simply in New England, closely observing the natural world with the eye of a poet and a natural scientist. His nature writings include Walden (perhaps his best-known book), A Week on the Concord and Merrimack Rivers and his essay ""Walking"". Cape Cod was first published posthumously in Boston in 1865. Martin Luther King Jr described Thoreau's essay On Civil Disobedience as his first contact with nonviolent resistence."