GRRM has stated that Fire and Blood book was the first part and there will be a second part coming...
George Raymond Richard Martin (born 1948 in Bayonne, New Jersey), is an American author and screenwriter of science fiction, horror, and fantasy. He majored from Norhwestern University in 1970.
Martin sold his first science fiction story in 1971 and has been writing professionally since then. He spent ten years in Hollywood as a writer-producer, working on various television series and feature films. In the mid ‘90s he returned to prose, his first love, and began work on his epic fantasy series, A Song of Ice and Fire. He has been in the Seven Kingdoms ever since. Whenever he’s allowed to leave, he returns to Santa Fe, New Mexico, where he lives with lovely Parris, and two cats named Augustus and Caligula, who think they run the place.
Martin is the editor of the Wild Cards series.
He has won four Hugos, two Nebulas and a World Fantasy Award.