After spending some years as a physics and astronomy teacher and lecturer, John moved into IT, and now has over 30 years experience as a software developer, trainer and technical author. After breaking free from the rigorous constraints of technical authorship by penning a science fiction novel, he returned to IT with his book 'Learn Python Quickly'. This was written after he ran a Computer App Club at a local college, where he identified a need for an introductory book suitable for students wishing to learn how to do real coding.

In April 2014 he published his second Python book 'Learn Python 3'. This uses Python's Turtle Graphics module to bring Python code to instant life with on-screen 'turtles' that can be controlled by the reader. While still teaching serious Python programming, is great fun for young and not so young learners.

In July 2014 he published a book on a subject that has been dear to his heart since he was 10 - Astronomy. John has been active in astronomical societies since then, is a retired Fellow of the Royal Astronomical Society and has made many telescopes and designed and built observatories so is ideally qualified to pass on his knowledge and experience to others in this book.

In October 2016 he turned his attention back to IT and penned a beginners guide to Android App Programming.