I am just learning about this Chacham... Here is some biographical information about him:
http://www.torah.org/learning/hamaayan/5768/matos.htmlR' Ben Zion Abba Shaul z"lR' Ben Zion Abba Shaul was born in Yerushalayim in 1924 to R' Eliyahu, an immigrant from Persia, and his wife, Benaya. Although a shoemaker by trade, R' Eliyahu was also a dedicated scholar. Benaya, too, valued Torah study; when she was pregnant with the future R' Ben Zion, she asked every scholar she met to bless her that her son should grow up to be a talmid chacham.
At age 11, young Ben Zion entered Yeshivat Porat Yosef. His first teacher was R' Yehuda Sadkah, who taught a class of young prodigies that also included the future Chief Rabbi and renowned posek R' Ovadiah Yosef. R' Ben Zion continued to progress to the highest class taught by R' Ezra Attiah. Eventually, R' Ben Zion himself became rosh yeshiva.
When R' Ben Zion was about 20 years old, one of the leading American sages, R' Eliezer Silver, came to Yeshivat Porat Yosef in the company of a wealthy American who was investigating which yeshiva was most worthy of his sizable donation. R' Ben Zion was chosen as the student to be tested by R' Silver, who asked the young scholar a question in the obscure area of Taharot (laws of ritual purity). When R' Ben Zion gave his answer, R' Silver said that he had asked the same question 40 years earlier to R' Meir Simcha Hakohen of Dvinsk (author of Ohr Sameach and Meshech Chochmah) and had received the same answer. R' Ben Zion later told R' Attiah that he had a second answer to the question as well, but since the first answer sufficed to secure the donation, offering a second answer might have been considered showing-off.
R' Ben Zion was recognized by Ashkenazic and Sephardic scholars alike for his "amelut" (inadequately translated "effort" or "toil") at Torah study. It is said that when he finished delivering a Torah lecture, he would inevitably be soaked with perspiration. His hatmadah / diligence also was legendary. As a young married man, he lived next door to R' Ovadiah Yosef and even their walks to and from yeshiva together would be occupied with reviewing pages of Talmud by heart.
R' Ben Zion encouraged the study of kabbalah, but only for those who had purified their character traits. He used to say, "If a man doesn't know how to get along with his wife, how can he learn kabbalah and be called a mekubal?"
Besides his scholarship, R' Ben Zion was known for giving blessings that were fulfilled. When asked why he had this ability, he responded humbly, "Hashem promised Avraham that anyone who blesses Avraham's descendants will be blessed. When people come to me for blessings, they kiss my hand, which is a form of blessing to me. Thus, they themselves are blessed."
R' Ben Zion passed away on 19 Tammuz 5758 (1998). (Aleppo: City of Scholars p.83)