Eiseley's reputation was established primarily through his books, including "The Immense Journey" (1957), "Darwin's Century" (1958), "The Unexpected Universe" (1969), "The Night Country" (1971), and his memoir, "All the Strange Hours" (1975). Science author Orville Prescott praised him as a scientist who "can write with poetic sensibility and with a fine sense of wonder and of reverence before the mysteries of life and nature." Naturalist author Mary Ellen Pitts saw his combination of literary and nature writings as his "quest, not simply for bringing together science and literature ... but a continuation of what the 18th and 19th century British naturalists and Thoreau had done." In praise of "The Unexpected Universe", Ray Bradbury remarked, " is every writer's writer, and every human's human ... One of us, yet most uncommon ..."