Rav Yehuda Ashlag

Rav Yehuda Ashlag, also known as Baal HaSulam, was a Kabbalist and spiritual teacher. He was born in 1885 in Poland and later immigrated to Israel. Ashlag was a prominent figure in the development of the Kabbalistic movement and wrote extensively on the subject. He is best known for his work on the Ten Sefirot and his teachings on spirituality and the nature of reality.