Who Authored Tosfos?

A question everyone who learns Gemara asks: Who Authored Tosfos? 

Listen to the latest podcast as we explore the origins of the Tosfos Yeshivos, specifically the school of Rabbeinu Yitzchak Hazakein in Dampierre, France. What is the fundamental difference of Tosfos verses earlier commentaries on the Talmud? Who wrote the version of Tosfos printed on the side of every Gemara today?