For which role did joaquin phoenix win best actor?
Quick Answer
Joaquin Phoenix won the Academy Award for Best Actor for his portrayal of Arthur Fleck, also known as the Joker, in the 2019 film "Joker".
Explanation
Joaquin Phoenix received the Oscar for Best Actor for his performance in Todd Phillips' 2019 psychological thriller "Joker." In the film, Phoenix plays Arthur Fleck, a struggling comedian who descends into madness and adopts the persona of the iconic Batman villain, the Joker. The role demanded a dramatic physical transformation and an intense, emotionally raw portrayal, which earned widespread critical acclaim and multiple awards. Phoenix's performance was highlighted for its depth, nuance, and haunting authenticity, solidifying his status as a leading actor of his generation. The Academy Award was presented at the 92nd Academy Awards ceremony in April 2020.