Avraham Haim Yosef (Avi) haCohen Weiss (Hebrew: אברהם חיים יוסף הכהן ווייס‎; born June 24, 1944) is an American Open Orthodox ordained rabbi, author, teacher, lecturer, and activist who heads the Hebrew Institute of Riverdale in The Bronx, New York, from which he retired in 2015. He is the founder of Yeshivat Chovevei Torah, a rabbinical seminary he refers to as "Open Orthodox", a term he coined to describe an offshoot of Orthodoxy, founder of Yeshivat Maharat for Open Orthodox women, co-founder of the International Rabbinical Fellowship, an Open Orthodox rabbinical association founded as a liberal alternative to the Orthodox Rabbinical Council of America, and founder of the grassroots organization Coalition for Jewish Concerns – Amcha.He received his rabbinical ordination at the Rabbi Isa