Professor Jeff Craig is a Lecturer in Medical Sciences at School of Medicine at Deakin University, Waurn Ponds, Victoria. Prior to this, he spent twenty years as a researcher at the Murdoch Children’s Research Institute, Melbourne. He studies the role of epigenetics in mediating the effects of early life environment on the risk for chronic disease. He is currently developing epigenetic biomarkers from easy-to-collect biosamples. Dr Craig has established a number of longitudinal cohorts in collaboration with clinicians and epidemiologists. Most have involved twins, due their ability to resolve the effects of genes and environments, particularly in the prenatal period. His longest-running cohort, the Peri/postnatal Epigenetic Twin Study (PETS), is currently funded to study children at eleven years of age. Dr Craig is also a Chief Investigator on the NHMRC-funded Twins Centre of Research Excellence and President of the International Society for Twin Studies. He has a keen interest in the applications of his research for public health and to do this, he is engaging with the public and with colleagues from a wide range of disciplines. In the broader context, he is interested in the two-way interactions between human health and the health of the environment.