Afterward he studied electronics in Machon Lev and in Bar-Ilan University.
He is also director of the Zomet Institute for the interface of halakhah and technology and the editor-in-chief of the annual journal Techumin published by that institute. He edits the weekly newsletter Shabbat B"Shabbato and writes a weekly column therein. He writes commentaries about the Rabbinic interpretations of Tanakh (the Hebrew Bible).
Rabbi Rozen is active in many areas.
He helps implement technological innovations for halakhic observance at the Zomet Institute. These devices apply halakhic concepts to technological devices, mostly electronics, to enable using them within the rules of halakhah.
He also writes and publishes articles on Tanakh. His positions tend to be conservative both politically and religiously.
Yated Ne"eman falsely claimed that the rabbi provided halachic certification out of the desire for money.