Keiji Horikawa is Professor of Faculty of Science, University of Toyama. He is a geochemist who studies paleoceanography and paleoclimate from analysis of marine sediment cores using various geochemical methods, including radiogenic isotopes. He participated in IODP Exp 379 (Amundsen Sea) in 2019, and has studied the response of the West Antarctic ice sheet under Pliocene warm climate.
More about Keiji is here.