Stefan began piano lessons at the age of six, and in 1973 he began studies at the Vienna University for Music and Arts; Renate Kramer-Preisenhammer and Hans Petermandl were two of his teachers.
In 1985 Vladar won Vienna's VII Ludwig van Beethoven piano competition. In 1992 he participated in My War Years, a Canadian docudrama about Arnold Schoenberg and this composer's way to atonality. Vladar was awarded the Mozartinterpretationspreis of the Mozartgemeinde Wien in 1994. In addition to his concert career he's been the Grosses Orchester Graz principal conductor since 2002 and since 2008 principal conductor of the Vienna Chamber Orchestra.
- "Performers: S Vladar". Classicalarchives.com. Retrieved 7 August 2009.
- "Prizes and Awards". Archived from the original on 13 August 2013. Retrieved 20 December 2012.
- "Stefan Vladar, Conductor" (PDF). Archived from the original (PDF) on 26 February 2012. Retrieved 7 August 2009.
- "Stefan Vladar neuer Chefdirigent des Wiener Kammerorchesters". Das Wiener KammerOrchester. Retrieved 7 August 2009.