Following by a successful accomplishment, Gruber received the Golden Stars Award by the EU commission in 2009 and the Bank Austria Art Prize in 2010.

Gruber's teaching and administrative experience contributed to setting up many projects with his colleagues from other universities such as Bratislava, Rostock, London and other cities.

Based on his 25 years of efforts on scientific and artistic work with Slovakia and Austria (especially in Bratislava and Vienna), he was granted the Honor of Doctorate from the VSMU in 2014.

In cooperation with the University for Music and Performing Arts, Gruber organizes different concerts, workshops, and events on the topic of exiled composers.

The venues included the Maison Heinrich Heine, the Carnegie Hall, Palacio de Bellas Artes, and the Teatro Peón Contreras.