Jon studied Natural Sciences in Cambridge back in the 1970s. He then studied and worked on the early Internet from 1980, gaining an MSc and a PhD in Computer Science at University College London. In 2001, he left a personal chair at UCL to move back to Cambridge to take up the Marconi Chair. He has advised over 50 successful PhD students. He is a Fellow of the BCS, the IET, the ACM, the IEEE, and of the Royal Academy of Engineering and the Royal Society.