Kei Hashimoto received his Ph.D. in Science from the University of Tokyo in 2016. He then worked as a JSPS Research Fellow at Yokohama National University (2016–2017), where he later served as a Project Assistant Professor until 2021. He subsequently held the same position at the University of Tokyo from 2021 to 2023. Since 2023, he has been an Assistant Professor at Gifu University. His research focuses on soft polymer materials, including ion-conductive gels and supramolecular networks. He aims to develop environmentally friendly and mechanically robust materials for use in energy and sensing applications.