Genetic research in Add Health has been published in a wide range of social and biomedical science journals on topics such as substance use and dependence (e.g., Daw et al. 2013; Zeiger et al., 2008), depression (e.g., Fuemmeler et al., 2009), sexual behavior (e.g., Ge et al., 2007; McHale et al., 2009; Halpern et al., 2007), political participation (e.g., Dawes and Fowler, 2009), subjective well-being (e.g., De Neve, 2011), body mass index and obesity (e.g., North et al., 2010; Haberstick et al., 2010), crime and delinquency (e.g., Guo, Roettger and Cai, 2008), education (e.g., Nielsen, 2006; Shanahan et al., 2007), suicide (e.g., Cho et al., 2006), aggression (e.g., Hart and Marmorstein, 2009), friend selection (e.g., Boardman et al. 2012; Guo 2006), attention deficit hyperactivity disorder (e.g., Haberstick et al., 2007), conduct disorder and self-control (e.g., Schulz-Heik et al., 2010), family and peer relations (e.g., Cruz, Emery and Turkheimer, 2012; Harden et al. 2008), and methodology (e.g., Medland and Neale, 2010). More than half of these publications examine the ways in which the environment interacts with genetic markers to affect health and behavior outcomes. Below we describe in more detail some illustrative examples of genetic research in Add Health.