Personal life :
Robert Downey Jr. was born at Manhattan on April,1965, on a famous family composed of his father Robert Downey Sr.who was a writer/director and filmographer and his mother Elsie Ann Ford who was an actress. Both parents always insisted to him became an actor, so as a child he started acting on his father's film.
When he was 13 years old his parents got divorced, so he went to Los Angels to live with his father, but at the age 16 he moved to New York to live with his 
Professional life:
Robert made his firs feature films as a baby, but in 1987 he got his first leading role on the big screen in The Pick-up Artist. Less than Zero was his breakthrough performance, which his character was an cocaine addicted , at the time, it represented his personal life.The high point of his career was in 1993,when he was nominated for an academy award for best actor on his performance in Chaplin.
He played a lot off successful movies like: “Natural Born Killers,” (1994), “Gothika” (2003), “Iron Man” (2008), “Tropic Thunder” (2008), “Sherlock Holmes” (2009) and “The Avengers” (2012).
Drug addicted:
He was introduced to drugs by his father when he was just 8 years old and developed a full addiction at his 20 years.For the next several years, Downey’s life was a haze of prison, film makers and rehabs. The drugs problems cause his divorce and the unemployment of the show “ Ally McBeal” at 2001.
New Phase:
Since 2005, Downey's life has significantly turned around, he get married actress Susan Levin. He's an ardent student of Wing Chung kung fu, and through the support of his family and friends, he's been able to stay clean.
One of the people to
play a key role in his turnaround is Mel Gibson. . Gibson stuck by his friend's side,
even as Downey's life was completely unraveling, and when Downey was
unable to get something as routine as an insurance bond due to his past
troubles with the law, Gibson found him work, casting him in the 2003
film The Singing Detective. The two actors remain close friends today. Downey transformed from an often critically admired actor to an star of Hollywood.
