Sio-Hoi Ieng is currently an associate professor with Sorbonne Université, Paris, France, and a member of the Vision Institute, Paris. He was involved in the geometric modeling of catadioptric and non-central vision sensors and their link to the caustic surface. His current research interests include neuromorphic and event-based vision perception algorithms and computer vision, with a special reference to the understanding of general visual sensors, exploring cameras networks, and studying the connection between biologic and artificial vision.