Rabbi Zushe Blech is widely considered one of the world’s leading experts in modern Kosher food production and technology, serving for over twenty years in administrative and field positions relating to all aspects of Kosher certification. He served for fourteen years as a regional director for the Kashrus division of the Union of Orthodox Jewish Congregations of America (the “OU”), and has since served as a technical and Halachic consultant to virtually all of the major Kashrus certifying agencies worldwide.

He has written and lectured throughout the world on the entire gamut of Kosher issues, and has consulted with a number of major food manufacturers to educate them on Kosher issues, obtaining certification, and resolving Kashrus issues. He is a foremost authority on the integration of all aspects of modern food technology with Kosher requirements, including those relating to such cutting-edge issues as biotechnology and enzymology. Rabbi Blech is the author of the encyclopedic work Kosher Food Production (Blackwell) the definitive work on Kosher certification and his articles on Kosher certification have been published by a variety of Kashrus organizations worldwide.