Rabbi Zvi Yehuda Kook appointed Rabbi Stern and Rabbi Yochanan Fried to establish the Halacha Brura and Berur Halacha Institution, which Rabbi Stern has since run.
Following the passing of Rabbi Zvi Yehuda Kook in 1982, Rabbi Stern was appointed a teacher in the Mercaz HaRav Kook yeshiva [REF].