Kester has been teaching with AMG since March 2001. He studied English Literature at Durham University, and has TOEFL and TEFLA qualifications. At A level, he gained 4 A grades in English, History, Economics and General Studies, gaining the Joseph Priestly Prize for Academic Excellence , the TE Criek Economics Prize, and the DP Ackroyd English Prize. He also took a Special Paper in English Literature in which he gained a Grade 1. He is one of the most popular tutors at AMG, teaching the GCSE, iGCSE, AS, A Level and IB curricula, and his timetable is usually fully-booked. He also teaches towards the National Admissions Test for Law (LNAT) and he teaches for the IB Theory of Knowledge (TOK) qualification.