Das received his Ph.D. at the University of Chicago and is now an Associate Professor at the Department of Sociology & Centre on Population Dynamics at McGill University, Montreal. He is a life course scholar who works at the intersection of the social and biological sciences. His past research has focused on stress-metabolic pathways through which social pathologies get “under the skin.” A second cluster, based on evolutionary theories, has been on mechanisms connecting egocentric networks and other proximal ecologies to sex hormone levels, and downstream to social or sexual behavior. His current slew of projects is on “nature of nurture” patterns—genetic pleiotropy and gene-environment correlations—and their life course consequences.