I’ve read Mention My Name in Atlantis and all of the Brak books. Mention My Name in Atlantis was pretty good IIRC, the Brak books were inferior Conan imitations. He also wrote one of the Planet of the Apes sequels (Conquest of the Planet of the Apes). His SF was not overly memorable - the only one I still have in my RAM is On Wheels, a bad attempt to make fun of American car culture. I read some others in the dim past but have no recollection of them.
My southern wife is a big fan of the North and South series. VHS tapes of the series got her through recovery from back surgery. We even made a point to visit the place near Charleston where some of it was filmed.