During high school education he became a member of the Young Communist League of Yugoslavia - SKOJ (from Serbo-Croatian: Savez komunističke omladine Jugoslavije).

Rosenzweig studied and graduated from the Faculty of Agriculture at University of Zagreb.

Some of his poets were later published in a revolutionary writers collection "Riječi i Djela" (Words and Acts).

In April 1941, after Independent State of Croatia establishment, Rosenzweig was arrested and imprisoned at Savska cesta prison.

On July 9, 1941 Rosenzweig was killed by Ustaše together with Božidar Adžija, Otokar Keršovani, Ognjen Prica and Zvonimir Richtmann.