From 1998 until 2004 he sang at the Vienna State Opera: Il Conte in Le Nozze di Figaro, Silvio in I Paggliaci (next to Leo Nucci), Sharpless in Madama Butterfly, Wolfram in Tannhäuser, Gunther in Götterdämmerung etc. Guest performances brought him to Monaco (Faninal), Berlin (Sharpless and Wolfram), Amsterdam (Heerrufer and Fernando in Fidelio), Graz (Faninal), Lyon (Il Conte), Oslo (Wolfram), Hongkong (Wolfram), Jekaterinenburg and Blaibach (Wotan, Rheingold).
Since 2008 Geert Smits has a full professorship at the Hochschule für Musik und Theater in Hamburg. He gave Masterclasses at the Hochschule in Würzburg and together with Margreet Honig in Schloss Weinberg (Austria).
CD Recordings: Heine Songs (1996), Van Eijcken Song (1997), Das Rheingold (2005), 9. Symphonie Beethoven (2012), Brahms-Mahler-Schumann Songs (2013) Symphonie Beethoven (2012), Brahms-Mahler-Schumann Songs (2013)