(b. 1979), music theorist, recorder-player performing on replicas of period instruments, lecturer in the Music Theory Faculty of the Grażyna and Kiejstut Bacewicz Academy of Music in Łódź, where he holds courses in the history and performance practice of Baroque music and since 2011 he has been conducting the recorder class. He is an author of the first Polish translation of Johann Joachim Quantz’s treatise Versuch einer Anweisung die Flöte traversiere zu spielen (O zasadach gry na flecie poprzecznym, Łódź 2012). His academic research focuses on hermeneutic interpretations of the 17th/18th-century musical pieces, as well as aesthetics and performance practice of Baroque and early Classicism. As an instrumentalist he has played with numerous early music ensembles, such as Il Tempo, Ars Cantus, Umbraculum, St Louis Club and others. Marek Nahajowski is also invited as a guest lecturer to early music interpretation courses like The Early Music Forum at the Frederic Chopin Music University, Polish Summer Early Music Workshops in Kalisz and Gorzów Meetings with Early Music.