Brother of R’ Yisrael Ariel, founder of Machon HaMikdash.
From Wikipedia:
Yaakov Ariel is the chief rabbi of the city of Ramat Gan, Israel, and one of the leading rabbis of the religious Zionist movement. Ariel had served as the rosh yeshiva of the yeshiva in the abandoned Israeli settlement of Yamit in the Sinai Peninsula until 1982, and is currently the president of the Ramat Gan Yeshiva.