Blau earned his Bachelor of Arts degree in 1959 from Yeshiva College[2] studying Mathematics.
He earned a Masters of Science degree at Yeshiva University's Belfer Graduate School of Science in 1960, and was ordained at Rabbi Isaac Elchanan Theological Seminary in 1961[2] by Rabbi Yosef Dov Soloveitchik.
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).
On December 22, 2009 he was the moderator on a panel in Yeshiva University dealing with homosexual men in the Orthodox Jewish community.