The thesis consists of an annotated translation of Mean Free Path (2010), the latest poetry book written by the contemporary American poet and novelist Ben Lerner. He creates a poetic language marked by collisions and fragmentations, with disruptions to the meanings from one line to another, lines out of order or recombined etc. These features triggered reflections on the translation choices, which are discussed in notes on specific lines. Theoretical concepts relevant to the study of poetry translation, which give translators an active role, are intertwined with the notes. The author s poetic language is attuned to the way people communicate nowadays.