Georg Klein began his AR journey at Oxford's Active Vision Group, focusing on augmented reality and visual tracking from 2005 to 2009. His major contribution to the XR space is a breakthrough in SLAM technology that was demonstrated on an iPhone 3G in 2007, called Parallel Tracking and Mapping (PTAM).

This innovation showcased AR's potential on mobile platforms, earning accolades, winning the ISMAR 2008 tracking competition and a best paper prize for his advancements in AR tracking robustness.

In 2009, Klein joined Microsoft's MSN Advanced Engineering team, where he played a key role in the development of the HoloLens and built the Visual Inertial Odometry (VIO) system for the device. His work on HoloLens helped to progress the device from the early systems available in academia to a commercial product.