Ronson was born at the Wellington Hospital, St John's Wood, London, to Jewish parents, Laurence Ronson, a real-estate speculator and music manager, and Ann Dexter. His ancestors emigrated from Austria, Russia, and Lithuania. Ronson was brought up in Masorti Judaism and had a Bar Mitzvah ceremony. The Ronson family had been one of Britain's wealthiest families in the 1980s; however, "the Ronson family lost $1 billion of its own money in the property crash of the early 1990's."

In the Spring of 2010, Ronson confirmed the name of his new album Record Collection, and said that he hoped to have it out by September 2010. Additionally, Ronson announced the name of his new band, "The Business Intl.'", which is the alias adopted by Ronson on the third studio album. The first single "Bang Bang Bang". which featured rapper Q-Tip and singer MNDR was released on 12 July 2010, where it peaked at number 6 on the UK Singles Chart, giving Ronson his fourth Top 10 single. The single also entered the Irish Singles Chart, where it peaked at number 18. The second single from the album, "The Bike Song", was 19 September 2010 and features Kyle Falconer from The View and Spank Rock. The album was released on 27 September 2010. This is the first Ronson albums on which he features as a singer.  Although Ronson had never met Michael Jackson he was given the vocal track to a song titled "Lovely Way", sung by Michael Jackson, in 2010 to produce for Jackson's posthumous album Michael. He submitted the track, but it did not make the track listing for Michael. Ronson said about the rumours surrounding the vocals on the track (due to the controversy surrounding the Cascio tracks on that same album), "It was definitely him singing. I was given a vocal track to work with but I never actually met Michael. [...] It's in the vein of Elton John's 'Goodbye Yellow Brick Road' and John Lennon's 'Imagine'."  He provided the score for the 2011 film Arthur. Ronson was one of the artists featured in the 2012 documentary Re:GENERATION Music Project. His song "A La Modeliste" features Mos Def, Erykah Badu, Trombone Shorty, members of The Dap-Kings, and Zigaboo Modeliste.

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