Joseph David Keery (born April 24, 1992), known professionally in music as Djo, is an American actor and musician. He became known for playing Steve Harrington in the science fiction series Stranger Things (2016–present), and has since starred in the comedy film Free Guy (2021) and in the fifth season of the crime drama series Fargo (2023–2024).
Aside from acting, Keery is also a musician. In his early twenties, he released music under the name "Cool Cool Cool." Keery was a guitarist and drummer for Chicago-based garage and psych-rock band Post Animal. Their debut album was released in October 2015. In 2022, he took part in a summer music festival tour. His sophomore album Decide was announced in June 2022, along with the release of its first single "Change". The album was released on September 16, 2022, and received positive reviews. In 2024, the sixth track of the album, "End of Beginning", was released as a single after gaining popularity and becoming viral on social media.