Mannix grew up in Northern Ireland and attended Belfast Royal Academy where he developed his love for learning and achieved A*A*AAA grades in his A Levels in Further Maths, Maths, Biology, Chemistry, Physics respectively. Mannix read Mathematics at University College, London, while studying he tutored over 50 students in Maths and Science, including a Cabinet Minister’s daughter and the niece of the Prime Minister. Mannix has worked at a teaching intern in St Louise’s College, Belfast and Dartford Grammar School in England. Outside of tutoring, Mannix enjoys reading and sport and he is the only person in history to travel the length of a country on a scooter when he ventured down Ireland in 2016 raising £400 for charity.