In a career that has spanned 41 years to date, Prof. Bob Stone has had significant input into the Human Factors domain as a whole, as well as more specifically the VR, AR and XR field.   Despite his claim of being semi-retired, he is still involved in a great number of projects. In this discussion we talk about how he got into Human Factors, his work in the defence industry an then onto his research into Virtual Reality, Augmented Reality and Mixed Reality, with a focus on not only the evolution but where it will go next.