Over the last 10 years Dr Guest has been the lead simulation developer for the Human Interface Technologies (HIT) Team working in the areas of 3D modelling, virtual reality, electronic engineering, software development and Serious Games. His work has involved developing a wide range of training and educational systems including augmented defence planning tools, submersible vehicle piloting, bomb disposal systems, submarine safety, unmanned air vehicle control, medical procedures and robotic arm manipulation. He has also taught on the subjects of 3D modelling and computer graphics at the University of Birmingham and the University of Plymouth as a Royal Academy of Engineering lecturer.