Johanna was a member of the German girl band Samajona until 2002, after which she became the presenter of Total Request Live on MTV.

In 2005 she started working for VIVA, where she presented the show 17, now presenting the follow-up VIVA Live!, with her colleagues Gülcan Kamps, Collien Fernandes and Klaas Heufer-Umlauf.

In 2007, she presented the show Popstars-Das Magazin, which referred to the sixth season of Popstars under the title Popstars on Stage. The show aired on both VIVA and Pro7, the original Popstars channel.