Joseph Quesada is an American comic book artist, writer, editor, and television producer. He became known in the 1990s for his work on various Valiant Comics books, such as Ninjak and Solar, Man of the Atom. He later worked on numerous books for DC Comics and Marvel Comics, such as Batman: Sword of Azrael and X-Factor, before forming his own company, Event Comics, where he published his creator-owned character, Ash.

Ninjak is a fictional superhero appearing in comic books published by Valiant Comics. The original incarnation of the character was created by Mark Moretti and Joe Quesada, The character was first introduced as a ninja and spy in the Valiant Comics series Bloodshot in July, 1993. His appearance in that series served to encourage interest ahead of his own self-titled series, which began in November that same year. Acclaim Entertainment bought out Valiant Comics in 1996, after which Ninjak and other characters were rebooted. The Acclaim Ninjak series lasted only a year. Valiant Comics later returned and rebranded as Valiant Entertainment, and a new version of Ninjak, more in-line with the original incarnation, was introduced to readers in 2012.