Yosef Shaul Nathanson

19th century Polish rabbi, prolific author, posek, and a leading rabbinical authority of his day. Elected rabbi of Lemberg, he officiated for eighteen years and was a widely recognised rabbinical authority. A wealthy man, he did not take a salary from his community and was known for his charitable nature. His most controversial ruling was permitting the use of machinery to bake Matzah for Pesach, which created a widespread halakhic controversy at the time. He authored many works, most notably his responsa "Shoel U'Meishiv". He died childless in 1875.