The Kotzk Rebbe, known as Rabbi Menachem Mendel of Kotzk, was a prominent Hasidic leader in the 19th century. He was born in 1787 in Kock, Poland and became known for his sharp intellect and emphasis on authenticity in spiritual practice. His teachings often focused on the importance of inner truth and self-examination. The Rebbe established a Hasidic court in Kotzk, which attracted many followers seeking a deeper understanding of faith. His approach was sometimes seen as harsh, but it aimed to challenge superficiality in religious life. The Kotzk Rebbe passed away in 1859, leaving a lasting impact on Hasidic thought.