Final answer:
Edwin A. Abbott wrote 'Flatland' in 1884, and 'Sphereland' was authored by Dionys Burger in 1965.
Step-by-step explanation:
The author of Flatland: A Romance of Many Dimensions is Edwin A. Abbott, and it was first published in 1884. Flatland is a work of satirical science fiction that explores the nature of dimensions and is often referenced in discussions of geometry and higher dimensions. On the other hand, Sphereland, which serves as a sequel to Flatland, was written by Dionys Burger, and it was published much later, in 1965.