Yitzhak ben Mordekhai Gershon

Rabbi Yitzchak ben Mordekhai Gershon was a 12th century German Tosafist. He studied in Regensburg under Rabbeinu Tam and Rabbן Yitzchak ben Asher Halevi (Riva), and later served as the head of the city's bet din. He compiled tosafot to most tractates of the Talmud.
Works on Sefaria