Robert John Downey Jr. (born April 4, 1965), also known as RDJ, is an American actor. A son of a filmmaker, Robert Downey Sr and one of the highest-grossing actors of all time, his films as a leading actor have grossed over $14 billion worldwide. In 2008, Downey was named by Time magazine as one of the 100 most influential people in the world, and from 2013 to 2015, he was listed by Forbes as Hollywood's highest-paid actor. He is the recipient of numerous accolades, including an Academy Award, an Emmy Award, three Golden Globe Awards, two BAFTA Awards, and three Screen Actors Guild Awards.

At the age of five, Downey made his acting debut in his father Robert Downey Sr.'s 1970 film Pound. He subsequently worked with the Brat Pack in the teen films Weird Science (1985) and Less than Zero (1987). Downey's portrayal of Charlie Chaplin in the 1992 biopic Chaplin earned him a BAFTA Award for Best Actor and his first Academy Award nomination. Following a stint at the Corcoran Substance Abuse Treatment Facility on drug charges, he joined the TV series Ally McBeal in 2000. He won a Golden Globe Award for the role. Downey was fired from the show in 2001 in the wake of additional drug charges. He stayed in a court-ordered drug treatment program and has maintained his sobriety since 2003.

Downey made his acting comeback in the 2003 film The Singing Detective, after Mel Gibson paid his insurance bond, and went on to star in the black comedy Kiss Kiss Bang Bang (2005), the thriller Zodiac (2007) and the action comedy Tropic Thunder (2008). He also played Sherlock Holmes in Guy Ritchie's Sherlock Holmes (2009), which earned him his second Golden Globe, and in its 2011 sequel. Downey gained global recognition for starring as Iron Man in ten Marvel Cinematic Universe films, from Iron Man (2008) to Avengers: Endgame (2019).

Downey received acclaim for his role in Christopher Nolan's Oppenheimer (2023), winning an Academy Award, a Golden Globe, and a BAFTA Award for Best Supporting Actor for his portrayal of Lewis Strauss. He was nominated for a Primetime Emmy Award for playing multiple characters in the black comedy miniseries The Sympathizer (2024). He made his Broadway debut that year, playing the title role in Ayad Akhtar's McNeal.

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