Rainer Roos studied piano with Prof. Ong and conducting with Prof. Ungar at the Stuttgart Music University. At the age of only 20, he received a fixed engagement at the Stuttgart State Opera. Later, he became assistant conductor at the Bayreuth Festival and led performances at the opera houses of Heidelberg, Magdeburg, Luxemburg, Baden nearby Vienna and Vienna. As a guest conductor, he co-operated with numerous European orchestras such as the WDR Broadcasting Orchestra, the Luxemburg Philharmonic, the Paris Chamber Orchestra, the North West German Philharmonicor the orchestra of the Vienna Volksoper.
In 2011, Rainer Roos was appointed chief conductor of one of the greatest traditional Vienna ensembles and musical ambassadors of the city of Vienna: the Strauss Capelle Vienna, founded by Johann Strauss I in 1827. An honorary member since 2016, he has conducted the orchestra all around the world amongst others in Vienna, Moscow, Shanghai, Beijing, Athens, Brasilia, Manaus, Seoul, Warsaw, Stuttgart, Sofia or Bogotá. Since the season 2014/15, he also holds the post of artistic director at the opera festival in Zwingenberg, Germany. Honouring his achievements in the realms of opera, he was awarded the Gottlob-Frick-Medal in 2018. In 2019, Rainer Roos was appointed “Honorary Artist of Foshan Grand Theatre“ (China) and became dedicatee of the “Maestro Waltz“ in appreciation of his merits for Viennese music.