In the past, he served as the assistant principal at the
Maimonides School in
Brookline, Massachusetts, principal at the
Hebrew Theological College in
Skokie, Illinois, and principal at the
Jewish Educational Center in
Elizabeth, New Jersey. In communal life, Blau served as national president of Yavneh, the
National Religious Jewish Students Association, and as a member of that organization's National Advisory Board. He also served as vice president of the
National Conference of Yeshiva Principals. Blau is a member of the
Rabbinical Council of America and serves on the executive board of the
Orthodox Caucus, a national task force addressing practical issues challenging the
Jewish world. He is also on the executive commission of the Orthodox Forum and the rabbinic advisory board of USSR, (Students Serving Soviet Jewry). He has lectured and taught
Torah around the world. Blau previously served on the executive board of directors of
The Awareness Center. On December 22, 2009 he was the moderator on a panel in Yeshiva University dealing with homosexual men in the Orthodox Jewish community. Blau serves as one of the board of directors for
Jewish Community Watch, an organization focusing on child abuse awareness and prevention within the Orthodox community. In March, 2025, Blau made
Aliyah, immigrating to live in
Jerusalem. Immediately thereafter, he spoke, via video, at the inaugural conference of the American wing of
Smol Emuni ("the faithful left") held at
B'nai Jeshurun. He argued that the mainstream
religious Zionist movement in Israel had become intertwined with "extreme right-wing politics." In particular, he spoke out against the Israeli
Minister of Diaspora Affairs,
Amichai Chikli, for alienating diaspora Jewry. == Controversies ==