Koslovsky began her vocal training with Hilde Wesselmann in Essen. After graduation, she studied church music at the Hochschule für Musik Köln. She continued her studies with Bornemann in Hannover, Michaela Krämer in Düsseldorf and René Jacobs in Basel.
She specializes in music before 1800 and is a permanent member of the vocal ensemble Cantus Cölln. She is married to Konrad Junghänel, the conductor.The group appeared together with the ensemble Akademie für Alte Musik Berlin, Alta Ripa, Musica Antiqua Köln, Musica Fiata and Sequentia. Their interpretations have been aired by numerous domestic and foreign radio stations, and they have made numerous recordings. Besides her work as a soloist, she is also active as a voice teacher.
- "Johanna Koslowsky (Soprano)". Bach Cantatas. Retrieved 17 August 2014.
- Literature by and about Johanna Koslowsky in the German National Library catalogue
- Official website
- Miquel Cabruja: Cantus Cölln seit 20 Jahren auf der Suche nach Wahrheit – Der Traum geht weiter. Interview portraits.klassik.com