Michael Scott Rohan (born 1951 in Edinburgh) is a Scottish fantasy and science fiction author and writer on opera.
He had a number of short stories published before his first books, the science fiction novel Run to the Stars and the non-fiction First Byte. He then collaborated with Allan J. Scott on the nonfiction The Hammer and The Cross (an account of Christianity arriving in Viking lands, not to be confused with Harry Harrison's similarly themed novel trilogy of the same name) and the fantasy novels The Ice King and A Spell of Empire.
Rohan is best known for the Ice Age-set trilogy The Winter of the World. He also wrote the Spiral novels, in which our world is the Hub, or Core, of a spiral of mythic and legendary versions of familiar cities, countries and continents.
Source: Wikipedia, "Michael Scott Rohan", available under the CC-BY-SA License.