Rabbi Yirmiyahu Ullman studied Literature and Chemistry at Harvard University, later graduating from Williams College where he majored in History and the Sciences. After receiving his rabbinical ordination in Jerusalem, he published a 600-page halachic work titled “Iyunei Deah” that is studied by many aspiring rabbis preparing for semicha in Yoreh Deah. He is a rabbi at Ohr Somayach’s Jerusalem campus where he teaches Talmud and Jewish Law, lectures on a variety of topics in Jewish thought and also writes the “Ask the Rabbi” column for the Yeshiva’s website and Ohrnet publication. He has published articles in numerous Jewish magazines and journals, has contributed to kiruv projects with Ner L'Elef and Partners in Torah, and speaks to various audiences world-wide.