Sylvia Engdahl is the author of ten science fiction novels, six of which are Young Adult novels that are also enjoyed by adults. Although she is best known for her Newbery Honor book "Enchantress from the Stars," her other YA novels are for older teen readers and her four latest novels are adult SF. In addition she has published a nonfiction book, "The Planet-Girded Suns: The Long History of Belief in Exoplanets." She has also worked as a freelance editor of nonfiction anthologies for high schools (most of the nonfiction books that appear in Amazon's catalog under her name are those edited by her in this capacity). She is a strong advocate of space colonization, and besides a widely-read space section of her website she created the site www.spacequotes.com, which contains quotations about why humankind must expand into space. She welcomes visitors to her website at www.sylviaengdahl.com.