Maajid Usman Nawaz is a British activist and former radio presenter. He was the founding chairman of the think tank Quilliam. Until January 2022, he was the host of an LBC radio show on Saturdays and Sundays. Born in Southend-on-Sea, Essex, to a British Pakistani family, Nawaz is a former member of the Islamist group Hizb ut-Tahrir. His membership led to his December 2001 arrest in Egypt, where he remained imprisoned until 2006. While there, he read books about human rights and made contact with Amnesty International who adopted him as a prisoner of conscience. He left Hizb-ut-Tahrir in 2007, renounced his Islamist past, and called for a secular Islam. Later, Nawaz co-founded Quilliam with former Islamists, including Ed Husain.

Samuel Benjamin Harris is an American philosopher, neuroscientist, author, and podcast host. His work touches on a range of topics, including rationality, religion, ethics, free will, neuroscience, meditation, psychedelics, philosophy of mind, politics, terrorism, and artificial intelligence. Harris came to prominence for his criticism of religion, and is known as one of the "Four Horsemen" of New Atheism, along with Richard Dawkins, Christopher Hitchens, and Daniel Dennett.