John Byrne is a British-Canadian comic book writer and artist, known for his influential work at Marvel Comics and DC Comics starting in the 1970s. He is credited with co-creating characters such as Kitty Pryde and Bishop, and revitalizing iconic series like X-Men, Fantastic Four, Alpha Flight, The Avengers, and Superman. His storytelling and artistic style made him a key figure of the Bronze Age and Modern Age of comics.