Hacham Shimon Maimon was born to Asilla and Hacham Khalifa in Gabès, Tunisia. He began his Torah studies with Hacham Yitzhak Bokobza and continued with Hacham Haim Houri, who would be his main teacher.
Hacham Shimon Maimon married Fortuna, and the couple had five children. Their son, Nissim, died in 1942 at the age of fourteen after much suffering.
Hacham Shimon Maimon officiated as rabbi of the Torat Haim yeshiva and following Hacham Haim Houri's departure for Israel in 1954, replaced him as the dayan and rabbi of Gabès.
Hacham Shimon Maimon eventually also immigrated to Israel, settling in Beer Sheva, where he became known for his love for all Jews and for the unique salvation [segulaI] he offered to all those in need.
Hacham Shimon Maimon passed away on 22 Shevat, 5741 (1981).
His book of sermons, Ohel Shem, was published in Tunis in 1950; Shem Me'Shimon - his series of books on sermons, Talmudic rules, and original commentary - was published in Israel, as was an additional book, Shlom Yerushalaim.