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 between 2015 and 2017. Hartl is the author of the thematic catalogue of Kapralova's works, published by the Czech Radio Publishing House in December 2020, and of Kauza Kapralova, published by Klic Books in June 2021. In 2021 she co-edited The Women in Music Anthology, published the same year by the Kapralova Society. She is currently working on an English version of the aforementioned thematic catalogue, to be published in 2025, and collaborating on a script for a feature-length documentary on Kapralova (theatrical release 2025).