Holger is Professor for Macroeconomics and Development Economics at the University of Göttingen. His research interests include development economics, population economics, and health economics. In health economics, he proposed a new approach to human health and longevity that considers health status from the medical viewpoint as the accumulation of health deficits such as illnesses and functional limitations. Using a metric from gerontology, the frailty index, predictions of the new theory are straightforward to test empirically. Recent applications include the gender health gap, the health gain from marriage, self-control problems in health behaviour, smoking, depression, painkiller addiction, and more. Holger Strulik is an Associate Editor of the Journal of Demographic Economics and the Journal of the Economics of Ageing.