Harry O'Brien is a very experienced primary teacher and an award winning author. Over the last 25 years he has written numerous best-selling primary textbook series including Maths Plus, Maths Plus Mentals and Homework, Spelling Conventions. Harry is the creator and major author of  Maths Box Lime, Orange and Aqua. He is also a major author of the enormously popular Reading Box Yellow, Blue, Red and Green. On top of his busy publishing and writing workload, Harry oversees the day-to-day running of the company.