Soon-gi is an optic specialist in LetinAR, Korea, since May 2018. He applies pin mirror technology to the conventional and new optical architectures to achieve the best quality of see-through optics for wearable AR devices. Before joining LetinAR, he researched various display optics including autostereoscopy, multi-focal displays, light field optics and holography as a senior research scientist in Korea Institute of Science and Technology.