Hiroyuki Hioki is a Professor in the Department of Neuroanatomy at Juntendo University Graduate School of Medicine. He received M.D. from Faculty of Medicine Kyoto University (2003), and Ph.D. in neuroscience from Graduate School of Medicine Kyoto University (2008). He has an interest in the neuronal circuitry in the central nervous system, especially in the neocortical microcircuit. Based on what principle, does the cerebral neocortex realize higher-order functions such as cognition, thinking, memory, and emotion? To unlock the mechanisms of the functions, it is absolutely essential to understand the neural network, which forms the structural basis of the brain. This is because “without structure there is no function”. He aims to unravel the grand design of the central nervous system, especially the neocortex, while developing innovative tools to facilitate morphological analysis.