He is also a prolific arranger and orchestrator in a variety of music genres. Poznansky is a pianist and began his career as a performer before arranging music for numerous productions in the Israeli repertory theater, primarily at the Cameri (Tel Aviv's municipal theater) and Habima (Israel's national theater). His notable film scores include Joseph Cedar’s Footnote, the late Assi Dayan’s Dr. Pomerantz, Shira Geffen’s Self-Made, Amos Gitai’s feature Rabin, the Last Day, and Schnitzel. In 2012, Poznansky scored the second season of the Israeli TV series Hatufim, directed by Gideon Raff, which was later adapted into the American television series Homeland. His Waltz for Flute and Piano, Life of the Dead: A Song Cycle for Female Choir, and Four Miniatures for Violin and Piano are published by Edition Svitzer, and have been performed worldwide.