Philip Carter is an IQ expert and has produced many books covering all aspects of testing, puzzles and reasoning. These include The Brain Fitness Workout, Advanced IQ Tests, IQ and Aptitude Tests, IQ and Personality Tests, IQ and Psychometric Test Workbook, IQ and Psychometric Tests, Test and Assess Your Brain Quotient. With the late Ken Russell he wrote Succeed at IQ Tests, Test Your IQ, Test and Assess Your IQ and Ultimate IQ, all published by Kogan Page.