Joe Alwyn received post-release recognition as a co-producer of Taylor Swift’s “august.”
The song’s original Folklore liner notes credited Swift and Jack Antonoff as producers. After Folklore won Album of the Year at the 63rd Annual Grammy Awards, the Recording Academy recognized Alwyn as a co-producer.
Alwyn worked on the album under the pseudonym William Bowery. He contributed to several Folklore and Evermore songs, making his production and songwriting role easy to overlook when examining the public credits.
This question is especially prone to confusion because Aaron Dessner was another major Folklore producer, while Antonoff co-wrote and co-produced “august.” The precise answer concerns the later recognition attached to Alwyn’s contribution.