Oleg Sergeyev, M.D., Ph.D, is an endocrinologist, and Senior Researcher and Chief of Epigenetic Epidemiology Group, at the Belozersky Research Institute of Physico-Chemical Biology, Moscow State University, and Director of the NGO “Chapaevsk Medical Association”, a member of IPEN. His research is focused on the physiology of growth, sexual maturation, and impact of environment, including endocrine disrupting chemicals, on growth, reproductive outcomes, and the epigenome among healthy populations and patients of IVF clinics. He is the Russian co-PI of a US NIH-funded prospective cohort “Russian Children’s Study” within 20 years. He and colleagues recently established a multidisciplinary study to investigate sperm and leukocyte epigenomes in human/rats in sensitive windows funded by Russian Science Foundation. In addition, he is co-author of 41 publications indexed by Web of Science with h-index 16.