Dr. Joel Sadler is a leading educational technologist and XR expert on playful creator tools. He co-founded PatchXR, where he leads the design of the low-code authoring tools to make it easy for anyone to create interactive XR worlds. He is the co-founder of several technology startups, including Piper Learning that teaches kids hands-on maker and STEM skills through virtual 3D worlds and physical DIY building kits. TIME magazine recognized Dr. Sadler as a top inventor for his early career in developing the Stanford-JaipurKnee, a radically affordable prosthetic technology for the developing world. As adjunct faculty at Stanford University he teaches courses leveraging VR/AR/XR to teach hands-on skills in virtual classrooms. He is a former Stanford Bio-X Fellow, and lecturer at the Stanford Design School where he lectured on design thinking and rapid prototyping. He holds ME/CS degrees from MIT/Stanford and has over 20 publications on the theme of technology to amplify human ability to build, play, and learn.