Prof. Dr. Hyung Wook Choi is a professor in the Department of Electrical Engineering at Gachon University. He received his Ph.D. in Electrical Engineering from Yonsei University in 1996. Currently, he is the chairman of the Energy Nano Research Center at Gachon University where his research focuses on understanding the structure–function relationship in energy and nanomaterials for the design and discovery of efficient hybrid perovskites.