George R. R. Martin writes in the fantasy genre.
George R. R. Martin . George Raymond Richard Martin ( born George Raymond Martin ; September 20 , 1948 ) , often referred to as GRRM , is an American novelist and short-story writer in the fantasy , horror , and science fiction genres , screenwriter , and television producer . He is best known for his international bestselling series of epic fantasy novels , A Song of Ice and Fire , which was later adapted into the HBO dramatic series Game of Thrones .