[2] At age 13, Mogensen made his debut as a soloist in a German TV broadcast with the Munich Symphony Orchestra.

Mogensen studied at the Royal Danish Academy of Music, where his teachers included Geir Draugsvoll.

In 2008, he received a grant of 300,000 DKr from the Statens Kunstråds Musikudvalg (Danish Arts Council Music Committee) in support of his career.

Several composers have written new works for Mogensen, including Anders Koppel (Concerto Piccolo), Martin Lohse (In Liquid), and Niklas Schmidt (Concertino for accordion and brass).

Mogensen has recorded commercially for the Da Capo label, including the commissions from Koppel and Lohse.