He has published works on Germanic historical phonetics, English etymology, mythology/folklore, the history of philology, and poetic translation.
Liberman's academic adviser was Professor M. I. Steblin-Kamenskij, at that time a Soviet scholar in Old Icelandic literature and Germanic historical phonology.
In 1972 he defended his Doctor of Philological Sciences dissertation (= West European habilitation) titled "Icelandic Prosody."
4) The greatest phonetic changes in the history of Germanic were the concentration of all distinctive features in the root syllable and consonantal lenition as its consequence.
Liberman seeks to build an exhaustive purview of previous conjectures and hypotheses on word origins.
His team has collected tens of thousands of articles on etymology from hundreds of journals, book chapters, and Festschriften, which feed his works.
His poetical works include translations and extended commentary on Mikhail Lermontov, Fyodor Tyutchev, Evgeny Boratynsky, and Shakespeare.