רבי יוסף כ"ץ מחבר ספר שו"ת "שארית יוסף", היה ראש ישיבה, ואב בית דין בעיר קרקוב שבפולין, גיסו של הרמ"א.
Joseph ben Mordechai Gershon HaKohen Ka"tz was a kohen, a rabbi and Talmudist, who began his studies in the Talmud at an early age, and became the dean at a yeshiva founded for him by his father-in-law. His views on religious questions were widely sought, while Solomon Luria was one of his correspondents.
On Wikipedia: עברית · English — summary from Wikipedia, CC BY-SA