Christensen began his career as a comedian in the late 1980's. He began working as a TV host in 1991. Four years later he had his big breakthrough with the entertainment show 'Husk lige tandbørsten' (1995) and his success continued with the radioprogram 'Tæskeholdet' (1996-1997), the sketch show 'Casper & Mandrilaftalen' (1999) and the sitcom series 'Langt fra Las Vegas' (2001-2003).
In 2005 Christensen created the series 'Klown', which became one of the greatest successes in recent Danish television. The series ran for seven seasons, the latest airing in 2018 after a nine year long hiatus. The 'Klown' franchise continued in 2010 with the feature film 'Klown – the Movie', which was Christensen's feature film debut as a screenwriter, and the follow-ups 'Klown Forever' (2015) and 'Klown the Final' (2020).
He also wrote the screenplays for the comedys 'Undercover' (2016) and 'Dan-Dream' (2017).
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