After studies in Prague, Pecaric continued to study at the rabbinic department of the Yeshiva University in New York and the department of philosophy of the Columbia University (M.A.) and Charles University (Ph.D.). He has been living in Kraków since 1997 where he runs the Ronald S. Lauder Foundation aimed at providing education to the small local Jewish community as well as local Gentiles, and where he set up Pardes Lauder, a Jewish religious publishing house which has so far published 17 books, including a prayer book and Haggada for Passover.
He is the author of the first translation of the Torah from Hebrew to Polish to be made by a Jew after the Second World War. His translation, made independently of existing Polish translations, includes – Bereshit (Genesis, 2001), Shemot (Exodus, 2003), Vajikra (Leviticus, 2005) and Bemidbar (Numbers, 2005) and Devarim (Deuteronomium, 2006).