Yaakov Yosef Reinman is an American Orthodox rabbi, writer, historian, and scholar. His monographs and articles have appeared in many Jewish periodicals and his study of Talmudic contractual law (sefer Sufra Dishtara) is a text used in yeshivas throughout the world. In authoring his Ruach Ami series, he writes under the pen name Avner Gold.

He also co-authored the book One People, Two Worlds: A Reform rabbi and an Orthodox rabbi explore the issues that divide them with Reform Rabbi Ammiel Hirsch. A fluent speaker of several languages, Reinman has also become known as a translator for ancient Jewish texts into English.

He is a descendant of the Narol Hasidic dynasty. He lives in Lakewood NJ with his wife Zvia, formerly of Los Angeles.