John Cassaday is an American comic book artist and writer, known for his detailed and dynamic illustration style. He gained prominence in the comic book industry through his work on titles such as Astonishing X-Men and Planetary, showcasing his ability to blend storytelling with striking visuals. Cassaday has collaborated with various writers, including Warren Ellis and Joss Whedon, contributing to the success of several popular series. His work has earned him multiple awards, including the Eisner Award, highlighting his impact on the comic book medium and his reputation as a leading artist in the field.