Thomas Daniel Schlee (born October 26, 1957) is an Austrian composer, arts administrator, and organist. Life and work Schlee was born in Vienna as the elder of two sons of the Austro-German musicologist, theater scientist and music publisher Alfred Schlee (1901–1999) and of Margaret Molner. Therefore already from his early childhood on he has been in close contact with a large number of important personalities of the music of the 20th century. He studied at the University of Music and Performing Arts, Vienna with Michael Radulescu and Erich Romanovsky. He then earned a PhD in musicology and art history at Vienna University. During 1977–78, Schlee was an auditor in Olivier Messiaen's composition class in Paris and studied privately with composer and organist Jean Langlais. Upon returning to Austria, he also studied with composer Francis Burt. From 1986 to 1989, Schlee was dramatic advisor for music at the Salzburger Landestheater, 1988–90 he taught at the University for Music and Performing Arts Vienna and at the Institute for Musicology at the Salzburg University. From 1990 to 1998 he was Music Director at the Linzer Brucknerhaus and Artistic Director of the International Bruckner Festival in Linz. From 1995 on he worked for the Guardini Foundation Berlin and was Scientific Director of the international project “La Cité céleste”, dedicated to Olivier Messiaen. In that position he was responsible for exhibitions, concerts, competitions, monograph, lectures and symposia in 15 European cities. From 1998 to 2001 he was head of the Guardini Foundation, from 2004 to 2011 head of the advisory committee for music. From 1999 to 2003 Schlee was Vice General Manager of the International Beethoven Festival in Bonn. After this he was General Manager of the Carinthischer Sommer from 2004 to 2015 as well as a member of the university committee of the Mozarteum Salzburg (2008–2013). The composer As a composer, Schlee has written works in all forms, which have been published by Bärenreiter, Lemoine, Leduc, Universal Edition, Doblinger etc. He got commissions among others from Gesellschaft der Musikfreunde Vienna, Vienna Konzerthausgesellschaft, Süddeutscher Rundfunk (SDR), Camerata Salzburg, Ensemble 20. Jahrhundert, Wiener Musiksommer, Mürztaler Werkstatt, Upper Austrian Stiftskonzerte, Mariahilf-Kultur Graz, Cappella Nova Graz, Copenhagen Philharmonic, Göttingen Symphony Orchestra, Württembergische Philharmonie Reutlingen, International Beethovenfeste Bonn, International Organ Week Nürnberg, Siemens Arts Program, Guardini Foundation Berlin, Theater an der Wien Vienna, University of Music Graz, kunsthaus muerz, Ensemble die reihe, Bachfest Salzburg 2008, Southwest German Philharmonic Konstanz,