The film is directed by Todd Phillips from a screenplay co-written with Scott Silver, and stars Joaquin Phoenix as the Joker, alongside Robert De Niro, Zazie Beetz, and Frances Conroy. Set in 1981, Joker follows Arthur Fleck, a failed stand-up comedian who is driven insane and turns to a life of crime and chaos in Gotham City.

Source:: https://en.wikipedia.org/wiki/Joker_%282019_film%29