Completion of the “Mishnah”! (170–200 CE).
The embryonic discussions of the Mishnah started about 400 years earlier in Bavel (Babylon) and Jerusalem.
Exposition of the law by the scribes (Soferim)—particularly Hillel and Shamai (and their respective followings, noted above), and its elaboration by the Tannaim (high level sages) of the first and second centuries, particularly Akiva (noted above).
Final compilation was by Rabbi Yehudah Hanassi— Rabbi Judah, The Prince.