Sang Il Seok is a Distinguished Professor in the Department of Energy and Chemical Engineering at Ulsan National Institute of Science and Technology (UNIST) in Korea. He earned his Ph.D. in Inorganic Materials Engineering from Seoul National University, Korea. Following his doctoral studies, he pursued postdoctoral research at Cornell University in the USA, focusing on defects and transport in the Fe-Ti-O Spinel structure. He also gained valuable experience as a visiting scholar at the University of Surrey in the UK in 2003 and at École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland in 2006. Before joining UNIST in 2015, Sang Il Seok served as the principal investigator at the Korea Research Institute of Chemical Technology (KRICT) and held a dual appointment as a professor in the Department of Energy Science at Sungkyunkwan University. Recognized as a highly cited researcher by Clarivate Analytics since 2018, he has authored over 200 peer-reviewed papers, including several articles in prestigious journals like Nature and Science, where he served as the main corresponding author. His groundbreaking contributions to perovskite solar cells have been particularly notable, positioning him as a pioneer in the field. He has received numerous awards throughout his career, including the prestigious "Korean Scientist Award" from the Korean government in 2017 and the Kyung-Ahm Prize in 2019. In 2022, he was honored with the esteemed Rank Prize for his groundbreaking work in perovskite solar cells. Sang Il Seok's research primarily focuses on functional inorganic-organic hybrid materials and their applications in devices, particularly perovskite solar cells. His expertise and dedication have solidified his standing as a respected figure in the fields of energy and chemical engineering.