Konstantin Ivanov Hadjiivanov is a Professor at the Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, and an Academician of the Bulgarian Academy of Sciences. He received his master’s degree from Sofia University in 1981 and his PhD from the Institute of General and Inorganic Chemistry in 1991. He undertook research specializations in Novosibirsk, Paris, Caen, and Munich, including a Humboldt Fellowship. He is a Doctor honoris causa of the University of Caen, a Jiangnan Distinguished Professor in China, and a recipient of the national Pythagoras Grand Prize for Overall Scientific Contribution. His research focuses on vibrational spectroscopy of adsorbed and surface species, isotopic spectroscopic methods, geminal adsorption complexes, surface acidity, and the adsorption and catalytic conversion of nitrogen oxides and CO₂ on zeolites, metal–organic frameworks, ceria-based materials, and other solids. He is a member of the American Chemical Society and Academia Europaea.