Kotaro Kitaya M.D. graduated from Medical School at Kyoto Prefectural University of Medicine in 1995. His research interests are in reproductive biology and pathology, particularly in fetal–maternal molecular/cellular interaction associated with repeated embryo implantation failure and recurrent miscarriage in infertility. Currently, he works as a reproductive endocrinologist at the Infertility Center, Iryouhoujin Kouseikai Mihara Hospital, Kyoto, Japan, and serves as an editorial board member for the American Society for Reproductive Immunology and Female Reproductive Tract Special Interest Group in the Japan Society of Reproductive Medicine.