First prize winner of several competitions on clarinet, piano and cello, Ottensamer has performed as soloist and chamber musician worldwide with partners such as the Vienna Virtuosi (members of the Vienna Philharmonic), the Vienna Chamber Orchestra and performers including Leif Ove Andsnes, Angelika Kirchschlager, Julian Rachlin and Yo-Yo Ma. In 2005, together with father Ernst Ottensamer and his older brother Daniel Ottensamer (both solo clarinettists of the Vienna Philharmonic), formed the clarinet trio The Clarinotts. The ensemble gives concert tours in Austria, Germany, Italy, Japan, the United States, performs at festivals all over the world, appeared on TV and radio and in 1999 recorded a CD published by Gramola Vienna and Octavia Records.