Oleksandr Kravchuk graduated at Kyiv Medical University in 1987 and holds PhD in Genetics since 1994. He started his career at L.I. Medved Institute of Eco hygiene and Toxicology immediately after his graduation, starting as physician and taking on the role of the Head of the Laboratory at the same Institute in the period from 1989-1998. In the period from 2000-2004 Oleksandr was Deputy Director of the Medved Institute after that he took on the responsibility of the Head of the Hygiene Regulation Committee of the Ministry of Health in Ukraine. Since 2014 and until today he is acting as the First deputy director of L.I.Medved’s Research Center of Preventive Toxicology, Food and Chemical Safety, Ministry of Health of Ukraine.