has he worked on anything else apart from music?
Yes, playwright, screenwriter, and comic book writer.
Roberto Aguirre-Sacasa
playwright, screenwriter, and comic book writer 
is 'the first time' an episode from glee? Yes, it is the fifth episode of the third season. who is the producer? Bradley Buecker what ratings did it receive? It garnered a 3.1/8 Nielsen rating/share in the 18–49 demographic. what is the plot? The episode features the preparations for performing "West Side Story" and the show's opening night, and the various events leading to the decisions by two of the show's student couples. when was the original performance made? UNANSWERABLE who composed the music? Roberto Aguirre-Sacasa
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Roberto Aguirre-Sacasa [SEP] Introduction
Roberto Aguirre-Sacasa (born 1973) is an American playwright, screenwriter, and comic book writer best known for his work for Marvel Comics and for the television series "Glee", "Big Love", "Riverdale" and "Chilling Adventures of Sabrina". He is Chief Creative Officer of Archie Comics.