Jack Callahan has been played on NTS shows including Post-Geography, with The Past, Present And Future Of Electronic Music (Uncut GRM) first played on 4 December 2020.

Jack Callahan is an American experimental musician and audio engineer. He is best known for performing under the moniker die Reihe, taken from the journal of the same name edited by Herbert Eimert and Karlheinz Stockhausen.