Veronika Hagen is a founding member of the Hagen Quartet, along with her siblings Lukas, Angelika (later replaced by Rainer Schmidt) and Clemens. The quartet has performed across the world.
She has made a number of recordings for the Deutsche Grammophon label, including the Brahms Sonatas with the pianist Paul Gulda in 1997 and Mozart's Concertante with the violinist Augustin Dumay and the Salzburg Camerata. As well as her activity as a soloist, she has performed with other leading musicians, including Elena Bashkirova, Joshua Bell, Gérard Caussé, Ivry Gitlis, Paul Gulda, Tatjana Grindenko, Steven Isserlis, Gidon Kremer, Alexander Lonquich and Heinrich Schiff.
She has also played at many international music festivals, and has performed with orchestras such as the Tokyo Symphony Orchestra and Orchestre de la Suisse Romande.
Hagen plays a Giovanni Paolo Magini (Brescia) Viola from the collection of the National Bank of Austria.