Simpson was born toBrad and Angie Simpson. He has two younger siblings, Tom and Alli. He is also a talented swimmer, winning two gold medals at the Queensland Swimming Championships. Simpson trained at the MiamiSwimming Club under coach Ken Nixon. Simpson's mother Angie works as a volunteer at the club.
Simpson began to record songs in his bedroom during the summer of 2009 on YouTube, performing "I'mYours" by Jason Mraz, "Cry Me a River" and "Señorita" by Justin Timberlake, "I Want You Back" by the Jackson 5, and his own songs, "One" and "Perfect". He was subsequently discoveredon YouTube by Shawn Campbell, a Grammy-nominated record producer who has produced for Jay-Z and other artists.
Simpson's rise to recognition was featured on The 7.30 Report inDecember 2009. He released his debut single, "iYiYi" (which features American rapper Flo Rida), on 15 May 2010. It was digitally released on 30 May 2010. The music video for "iYiYi" was releasedon 30 June 2010. The music video for Simpson's second single, "Summertime", was released on 20 September 2010.
Simpson relocated to Los Angeles in June 2010 with his family to record hissongs with Atlantic Records and his producer Shawn Campbell. His manager is Michael 'Blue' Williams.  That same month, Simpson appeared on Sunrise. On 22 June 2010, it was announced thatSimpson would participate in the Camplified 2010 Tour, along with other artists, touring across the United States. The tour began on 5 July 2010 and ended on 14 August 2010. It was also Simpson's firstpublic tour. While on tour, Simpson performed a song called "Love So Strong". In an interview with Popstar Magazine, Simpson stated that his inspiration for the song was "A girl, back home. That's...