Šteger's poetry collections and novels have been translated into more than 20 languages and published in journals such as The New Yorker, Süddeutsche Zeitung, Lettre International and Boston Review.

He has collaborated with musicians and composers, most notably Vito Žuraj, for whom he wrote the libretto for the composition der Verwandler/Alchemis t, which was premiered at the Eclat Festival in Stuttgart, Germany, 2019.

Aleš has collaborated with painter Dušan Fišer (V tvari project), photographer Stojan Kerbler (book What I Saw in Ptuj and Elsewhere) and several other visual artists.

Together with Matthias Göritz and Amalia Maček, he edited the anthology of contemporary Slovenian poetry Mein Nachbar auf der Wolke, Hanser, Munich, 2023.

He has edited selected poems by Edvard Kocbek, Gregor Strniša, Dane Zajc, Tomaž Šalamun and Niko Grafenauer, for which he has also written extensive accompanying studies.

He maintains an air of philosophical sophistication while imbuing his work with a laconic nature and aberrant minimalism that makes it distinct and vivid in the memory.

Šteger takes an original approach to this question by not systematically pursuing the “thing-in-itself” and attempting to bring words as close as possible to it, as Francis Ponge did.” Poetry Today, The Antioch Review, Volume 70, Number 1, 2012 about “The Book of Things” "Steger has a tremendous capacity for juxtaposition, and the poems offer a great many startlingly moments…[His] flair is in not pausing at the virtuoso moment but brushing past as it drops."