Rabbi Zushe Blech is 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. His articles, many of which are included in Kosher Food Production, have been printed in major Kosher periodicals and publications, such as the Daf ha'Kashrus (OU), Kashrus Magazine, and News & Views (MK). At present, Rabbi Blech directs Kosher certification for 'Kehillas Bais Benzion' in Monsey, NY, and serves as the 'Kashrus' Administrator of EarthKosher Certification.