Yehiel Nissim da Pisa (Vitale) (1507–1574) was an Italian-Jewish banker, writer, and philosopher, who wrote a treatise on the use of credit, Ma'amar ḥayei olam at inyan haribit, as well as several texts on philosophy, usury and loans.

[1] He describes the use of bills of exchange in Haye Olam which translates as Eternal Life.

[5] After the licenses for Jews to operate the family's businesses were revoked by the Florentine government,[3] he became a scholar and a kabbalistic authority.

[6] In his philosophic works, he was critical of Aristotelianism, Gersonides and Maimonides, preferring anti-rationalism, arguing that the kabbalah, Torah and Jewish tradition were self-sufficient sources of knowledge, and emphasized the uniqueness and spirituality of the Jewish people.

He cited the Zohar, Judah Halevi and Nahmanides, Averroes, particularly his commentary on Aristotle's Physics, and Agostino Nifo.