Is George RR Martin a producer on Game of Thrones?

Related questions

1. Does George RR Martin like the end of Game of Thrones?
2. Is George RR Martin writing the prequel?
3. How much does George RR Martin make?
4. Will Game of Thrones end after season 8?
5. Does George RR Martin know the ending?
6. Is George RR Martin finished Game of Thrones?

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