Rabbi Yehuda Ashlag or Yehuda Leib Ha-Levi Ashlag also known as the Baal Ha-Sulam, (lit. "Master of the Ladder") - referring to his magnum opus, the Sulam - was an orthodox rabbi born in Warsaw, Congress Poland, Russian Empire), to a family of scholars connected to the Hasidic courts of Porisov and Belz. Rabbi Ashlag lived in Jerusalem from 1922 until his death in 1954 and is considered by many to be a great kabbalist. Wikipedia
The definitive Wikipedia entry for Yehuda Ashlag. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Yehuda_Ashlag
