Born on 24th of February 1957 in Linz, Austria, Lang finished highschool and piano studies at the Bruckner Konservatorium and moved to Graz to study jazz piano, arranging and classical piano.
There he also studied philosophy and German philology.
Between 1977 and 1981 he worked with various Jazzbands, the most important of which was the 'Erich Zann Septett'.
After having finished his piano studies he began studying composition with Polish composer Andrej Dobrowolsky, who introduced him to the techniques of new music. He also studied with Hermann Markus Pressl who taught him counterpoint and introduced him to the work of Josef Matthias Hauer.
Since 1988 he has been teaching music theory, harmony and counterpoint at the University of Music and dramatic Arts in Graz, and since 2003, has hold a professorship in composition there.
In Graz, he also met Gösta Neuwirth who was to become one of his main influences, and who instructed him in composition for many years outside of the university setting.
Georg Friedrich Haas introduced him to microtonal music and in 1988, commissioned a quartertone piece for the Musikprotokoll festival.
Since then his pieces have been performed at the Steirische Herbst Festival, at the Moscow Alternativa Festival and the Moscow Modern Festival, Biennale Hannover, Tage Absoluter Musik Allentsteig I and II, Klangarten I and IV, Resistance Fluctuation Los Angeles, Darmstädter Ferienkurse, Salzburger Festspiele, Wien Modern, Donaueschingen, Witten and many others.
In 1998 he was a guest lecturer in Peter Weibels Media class in Vienna.
In 2006 he was featured artist of the Wien Modern Festival in Vienna.
At the Institute for Electronic Music Graz he developed the Loop-Generator and the Visual Loop Generator with Winfried Ritsch and Thomas Musil.
He has various sound installations in his list of works, among them 'Schwarze Bänder' Musica Viva 2005.
Since 2003 there have been a number of collaborations with various choreographers: Xavier Le Roy, Christine Gaigg and Willi Dorner.
His main interest since 1999 is music theater, derived from his interpretation of the ideas of difference/repetition: 'Theater of Repetitions' 2003, 'I hate Mozart' 2006, 'The Old Man from the Mountain' 2007.
He also performs live as an improviser both solo and in duos.
Artist in Residence/Capell-Compositeur Dresden 2008'
He currently lives in Vienna.