After the army he worked as an editor in Maariv, becoming its military commentator in 1987.
In 1993 he moved into television, joining Channel 2's news company as diplomatic commentator and reporter. He moved to the new Channel 10 in 2002, where he was given his own debriefing program Ze HaZman (It's the Time). In 2006 he returned to Channel 2, and from February 2007 has been introducing Bottom Line with Ben Caspit and Dana Weiss. At the start of 2008 he started hosting a new programme, Black Box with Anat Goren..
In parallel to his work on television, Rosen also works on a satirical radio program with Danny Sides, Finish and Go on Tel Aviv Radio.