 Volume seven
By Eric Nolen-Weathington, Jon B. Cooke, John Byrne</ref>

Byrne is color blind for a narrow range of green and brown tones.During the first year that Byrne illustrated "Iron Fist", he believed that the protagonist's costume was brown.<ref></ref> While he experimented with his own hand-developed lettering fonts in the early 1980s, he has since begun using a computer font based on the handwriting of the letterer Jack Morelli.<ref name="FAQProcess"></ref>

Byrne became a naturalized American citizen in 1988.He was married to photographer and actress Andrea Braun Byrne for 15 years until divorcing.