Reinhard Wieser studied with Prof. Alfred Prinz of the Vienna Philharmonic Orchestra. He won the position of Principal Clarinet of the Vienna Symphony Orchestra at the age of nineteen.

Additionally to his career in the orchestra, he holds a good reputation as a soloist. This features such renowned conductors as Adam Fischer, Claus Peter Flor, Fabio Luisi (the past Principal Conductor of the VSO), Johannes Wildner, Miguel Á. Gómez Martínez, Oleg Caetani, Rafael Frühbeck de Burgos, Bertrand de Billy, Yakov Kreizberg and Georges Pretre.

Besides this, Reinhard Wieser plays chamber music with the Wiener Kammermusiker, the Johann Strauss Ensemble of the Vienna Symphony Orchestra and other renowned artists, such as Renaud Capucon and Philippe Jordan, the current chief conductor of the VSO. He has recorded „Theme and Variations for Clarinet and Strings“ by Jean Francaix for Camerata Tokyo with his colleagues of the Wiener Concert Verein.

Since 1996 Reinhard Wieser heads his studio in the Music and Arts University of the City of Vienna (MUK). He has hosted numerous master classes in Austria, Germany, Spain, Malta, Venezuela, Japan and the USA (Bloomington Jacobs School of Music, Michigan State University).