John Koslovsky studied music theory at McGill University (BM 2003) and at the Eastman School of Music, University of Rochester (MA 2006; PhD 2010). He teaches on the music theory faculty at the Conservatorium van Amsterdam and is currently a research affiliate in the humanities at Utrecht University. He has previously taught at the Eastman School of Music (2003-2009) and at the Oberlin Conservatory of Music (2009-2010).
Broadly, his research engages the history of music theory and musicology in the first half of the twentieth century. His dissertation, From Sinn und Wesen to Structural Hearing: The Development of Felix Salzer’s Ideas in Interwar Vienna and their Transmission in Postwar United States (University of Rochester, 2010), examined the work of the Viennese musicologist and theorist Felix Salzer. As part of this research project he catalogued the Felix Salzer Papers of the New York Public Library (2007) and was awarded a Fulbright scholarship to undertake archival research in Vienna, Austria (2007-2008). He has published both historical studies related to Schenkerian history and to analytical studies of composers from across the European art tradition, including Guillaume de Machaut, Johannes Ockeghem, Franz Schubert, Béla Bartók, Paul Dukas, and Claude Debussy.
He is currently engaged in two projects. The first of these is a book that traces Salzer's impact on the broader development of Schenkerian theory in the United States since the Second World War. The second involves the broader role of Richard Wagner's Tristan und Isolde in the history of analysis from the late 19th century to the present day.
John is also member of Schenker Documents Online, a project that seeks to digitize all the personal documents of Heinrich Schenker. As part of this research team he has transcribed and translated the complete correspondence of Walter Dahms, a music critic and journalist active in Germany and Italy in the 1910s and 20s. More recently he has begun working on Schenker's correspondence with Herman Roth.
Since 2011 John has been on the board of the Dutch-Flemish Society of Music Theory, and since 2015 has served as president.