Weinberg was also a rabbinical advisor and board member in Haredi and Orthodox institutions such as Torah Umesorah, Agudath Israel of America and the Association for Jewish Outreach Programs.

During World War I, Yitzchak Mattisyahu was forced to leave Palestine and move to America because he was framed in the killing a young Arab girl; he brought his family to join him in New York in 1921.

[4] Weinberg was regarded as a master logician, with broad knowledge and depth in all aspects of Jewish law and philosophy.

[citation needed][2] He was also a sought-after counselor, involved in hundreds of private and public issues and concerns within the Jewish community.

[citation needed] He often took the lead in "question and answer" sessions at Torah Umesorah conventions where hundreds of rabbis would seek his counsel and many of these teachings have been published, as in Rav Yaakov Weinberg Talks About Chinuch[5] His student Rabbi Boruch Leff based his teachings on Weinberg's methods in Forever His Students: Powerful essays and lessons on contemporary Jewish life, inspired by the teachings of Rabbi Yaakov Weinberg.

[9] His activities and views were also cited in a 1982 work researched and published by Professor William Helmreich at CUNY Graduate Center, titled The World of the Yeshiva: An Intimate Portrait of Orthodox Jewry.

At the same time the AVI CHAI Foundation also endowed a new institute at the Ner Israel yeshiva in Baltimore known as the MAOR Institute that would train its yeshiva graduates to become proficient "outreach rabbis" that would dovetail with AJOP's mission of enhancing the already extant field of outreach workers.

Thus Weinberg headed both MAOR and AJOP that were both aimed and enhancing the field of reaching out to non-Orthodox Jews.

Weinberg guarded his position in AJOP and ensured that his allies, such as Rabbi Ephraim Buchwald (AJOP first president) and himself the founder of another multimillion-dollar AVI Chai Foundation project the National Jewish Outreach Program (NJOP), remained in its leadership positions.

Targum Press published Weinberg's Fundamentals and Faith: Insights into the Rambam's Thirteen Principles.

[13] Orthodox magazines, such as The Jewish Observer, have published many of Weinberg's speeches that later were also reprinted in ArtScroll books.

Unlike Weinberg, Feldman was accepted and serves as a full member of the Moetzes Gedolei HaTorah of the American Agudath Israel.