* The Mishnah: The core of the Talmud, the Mishnah was compiled by Rabbi Judah HaNasi (also known as Rabbi Yehuda ha-Nasi) in the 2nd century CE. He collected and codified the oral law, which had been passed down through generations of Jewish scholars.
* The Gemara: The Gemara is the commentary on the Mishnah. It consists of extensive discussions and interpretations of the Mishnah by later rabbis. There are two main Gemaras:
* The Jerusalem Talmud: This was compiled in the Land of Israel around the 4th century CE.
* The Babylonian Talmud: This was compiled in Babylonia around the 6th century CE. It is larger and more widely studied than the Jerusalem Talmud.
Therefore, the Talmud is a collaborative work of many generations of rabbis. While Rabbi Judah HaNasi played a crucial role in establishing the Mishnah, the Gemara reflects the work of countless other scholars who contributed their insights and debates.