Joseph Hill Whedon, known professionally as Joss Whedon, is an acclaimed American screenwriter, director, producer, comic book writer, and composer. He is the founder of Mutant Enemy Productions, co-founder of Bellwether Pictures, and has created several influential television series.

Whedon's career began in sitcoms, but he made a significant impact with the horror comedy film Buffy the Vampire Slayer (1992), which he then adapted into the iconic TV series of the same name and its spinoff Angel. His other notable works include the space Western Firefly and its film continuation Serenity, the Internet musical miniseries Dr. Horrible's Sing-Along Blog, the science fiction drama Dollhouse, the Marvel Cinematic Universe series Agents of S.H.I.E.L.D., and The Nevers.

Whedon has contributed significantly to the film industry by writing and directing The Avengers and its sequel Avengers: Age of Ultron. He also worked on Justice League, assuming directorial duties during the re-shoots. His versatile talents extend to composing, notably for the musical episode "Once More, with Feeling" of Buffy the Vampire Slayer and Dr. Horrible's Sing-Along Blog, as well as writing comic books, including the series Astonishing X-Men.

Despite his success, Whedon has faced accusations of abusive behavior on set by multiple actors, which he has denied. Following these allegations, WarnerMedia conducted an investigation and reported taking remedial action in December 2020.