Christopher Eric Hitchens (13 April 1949 – 15 December 2011) was an Anglo-American author, columnist, essayist, orator, religious and literary critic, social critic, and journalist.
Definition from Wikipedia – Christopher Hitchens
Tariq Ramadan (Arabic: طارق رمضان; born 26 August 1962) is a Swiss academic, philosopher and writer. He is the Professor of Contemporary Islamic Studies in the Faculty of Oriental Studies at St Antony's College, Oxford and teaches at the Faculty of Theology and Religion, University of Oxford.
Definition from Wikipedia – Tariq Ramadan