Hussein Aboubakr Mansour is an Egyptian-American intellectual, activist, public speaker, and writer specializing in Arab intellectual history, antisemitism, extremism, Islamism, Arab political thought, and the globalization of revolutionary radicalism. Born in Cairo, Egypt, into a conservative Muslim family that raised his brother to become an imam inspiring young people toward jihadism, he received a conservative Muslim education, grew up religiously devout, and was attracted to Salafist mosques from an early age. Mansour was also fascinated by antisemitic conspiracy theories prevalent in Egyptian popular culture and initially aspired to become a jihadist. He later underwent an intellectual transformation, which he chronicles in his 2020 memoir Minority of One: The Unchaining of an Arab Mind. He is an ISGAP research fellow and has contributed to publications including Foreign Affairs.