Sylvia Engdahl is the author of eleven science fiction novels, six of which, including the Newbery Honor book Enchantress from the Stars, are YA books also enjoyed by many adults. Although she is best known as an author for Young Adults, her most recent novels, the Founders of Maclairn duology (Stewards of the Flame and Promise of the Flame) and the Captain of Estel trilogy (Defender of the Flame, Herald of the Flame, and Envoy of the Flame) are adult science fiction and are not appropriate for readers below high school age. For FAQs about them and more, visit her website.
She has also written a nonfiction book, The Planet-Girded Suns: Our Forebears' Firm Belief in Inhabited Exoplanets, of which updated and expanded paperback and ebook editions were published in 2012, and three collections of her essays. Most of the nonfiction books listed under her name were edited, rather than written, by her as a freelance editor of anthologies for high schools.
Engdahl says, "I never listed more than a few of the books I read here and now the list is so outdated that i have removed all but a very few that are still among my favorites, plus ebooks I produced for my mother and for my friend Shirley Rousseau Murphy. For current lists of good books on the subjects I care about, please visit the Opinion section of my website."