Karla Hartl is founder and chair of the Kapralova Society, a Canadian music society founded in 1998 in Toronto to promote Czech composer Vitezslava Kapralova and other women in music. Hartl's research on Kapralova has been published in Tempo (Cambridge University Press), Journal of the IAWM (International Alliance for Women in Music), Kapralova Society Journal, VivaVoce (Frau und Musik), Czech Music Quarterly (Czech Music Fund), Journal of Czech and Slovak Music (The Dvorak Society of Great Britain), Martinu Revue (Bohuslav Martinu International Circle), Opus musicum, Harmonie, Tydenik Rozhlas (Czech Radio), and FOKus (Prague Symphony Orchestra). Hartl is co-editor of the first English-language monograph on Kapralova, The Kapralova Companion, published by Lexington Books (Rowman & Littlefield) in the United States in 2011 and shortlisted for the 2011 F.X. Salda Foundation Award. She collaborated on a five-hour radio documentary on Kapralova produced by the BBC Radio 3 for the composer's centenary in 2015, wrote an introductory chapter in another collective monograph on the composer, Vitezslava Kapralova (1915–1940): Zeitbilder, Lebensbilder, Klangbilder, published by Chronos Verlag in Zurich in 2017, and edited a multi-volume collection of Kapralova's correspondence, published by the Kapralova Society in 2015–2020. Hartl is the author of Vitezslava Kapralova: Tematicky katalog skladeb a korespondence s nakladateli (Thematic catalog of the works), published by the Czech Radio Publishing House in 2020 (an English-language version of the thematic catalog will be published by Bloomsbury in 2025), and of Kauza Kaprálová, published by Klic Books in 2021. She is also the co-editor of the Women in Music Anthology, published in 2021 by the Kapralova Society. In 2025, Hartl wrote a script for a radio series on Kapralova, produced by the Czech Radio 3 for the composer’s 110th anniversary, and collaborated on a feature-length documentary on Kapralova (theatrical release in 2026).