 He regularly appears as a guest conductor in major opera houses such as the New National Theatre Tokyo, the Arena di Verona, Leipzig, Vienna Volksoper, Graz, Salzburg, Prague and Zagreb State Opera, and with orchestras such as the London Philharmonic Orchestra, the Royal Philharmonic Orchestra London, the St. Petersburg Philharmonic, the Tokyo Philharmonic Orchestra, Bavarian Radio Symphony Orchestra, the Orchestra Sinfonica Siciliana at the Teatro Politeama, Palermo, the MDR Symphony, the Dresden Philharmonic, the Vienna Symphony, the Vienna Radio Symphony Orchestra, the Bruckner Orchestra Linz, the Mozarteum Orchestra Salzburg, the Danish National Symphony Orchestra, the China Philharmonic, and the Hong Kong Philharmonic Orchestra.Wildner has recorded over 100 CDs, DVDs and videos, including Johann Strauss' "Die Fledermaus" and Mozart's "Così fan tutte", live recordings of "Carmen" and "Le nozze di Figaro", Bruckner's Third and Ninth symphonies, and various CDs of previously unknown repertoire by Erich Zeisl, Joseph Marx and Johann Nepomuk David.In 2010 he released Robert Schumann's complete works for piano and orchestra, with pianist Lev Vinocour and the Vienna Radio Symphony Orchestra.