 Stieber held teaching appointments in Kraków, Lviv, Łódź, and Warsaw.His work in Polish and Slavic philology had a particularly strong influence on the introduction of the structural method in the teaching of phonology at the University of Łódź.The Nitsch-Trnka-Stieber Law (stating that phonemic contrasts in a language can only be produced by regular sound laws or borrowing, but not as a result of analogical changes in morphophonemic rules) remains a matter of debate today (cf.