In August 1985, Fr. Isaac gave a lecture, “The Juristic Mind: A Comparative Analysis of Gratian and Maimonides,” at the second international seminar on “The Sources of Contemporary Law” held in Jerusalem. This lecture was later printed in the proceedings of the Second International Seminar on the Sources of Contemporary Law: Maimonides as Codifier of Jewish Law, 1987.

At a seminar held at St. Vincent Major Seminary, Latrobe, PA in the fall of 1989, Fr. Isaac introduced to some academic and religious institutions in western Pennsylvania the concept of a research institute into monotheistic law (Judaism, Christianity, and Islam).

In August 1991, the office for the Tel Gamaliel Research Institute in Monotheistic Law opened at the Saint Peter of Sion Center where the Ratisbonne Christian Center for Jewish Studies was located in Jerusalem.