George R. Martin III
There is no known author named 'George R. Martin III'; the query likely refers to George R.R. Martin, the celebrated American author of epic fantasy, best known for the 'A Song of Ice and Fire' series adapted into 'Game of Thrones'. He was born on September 20, 1948, in Bayonne, New Jersey, and writes primarily in the fantasy, horror, and science fiction genres.
fantasy
horror
science fiction