Felix Henry Sater /ˈseɪtər/ (born Felix Mikhailovich Sheferovsky; Russian: Фе́ликс Миха́йлович Шеферовский; March 2, 1966) is a Russian-American mobster, convicted felon, real estate developer and former managing director of Bayrock Group LLC, a real estate conglomerate based out of New York City. He has been an advisor to corporations such as The Trump Organization, and the Mirax Group. Judge I. Leo Glasser confirmed that Sater helped the U.S. government track down Osama bin Laden as he provided the telephone number of Osama bin Laden.