Rav Aron Ettlinger was born in 1769 in Karlsruhe. He became the Rav of the Klause (small shul) in Karlsruhe and was also a Rosh Yeshiva. Although he is often overshadowed by his famous son Rav Yaakov (author of Aruch L’ner), Rav Aron was a well-known and greatly respected Torah scholar. Many teshuvos of the Aruch L’Ner dealing with difficult halachic issues are written between father and son. Rav Aron Ettlinger passed away in Karlsruhe in 1849.