My research focuses on social development across the lifespan, with a primary aim of understanding the formation, maintenance, and functions of close relationships during adulthood.  In my research I integrate theories and methods of social development with the closely related field of social psychology. My work in recent years has been influenced by the social developmental attachment theory and recent conceptualizations of responsiveness in close relationships. Specifically, I have been investigating the psychological mechanisms by which close relationships influence emotion regulation, psychological well-being, and physical health over time (e.g., Selçuk, Günaydın, Ong, & Almeida, 2016; Selçuk & Ong, 2013; Selçuk, Stanton, Slatcher, & Ong, in press; Selçuk, Zayas, Günaydın, & Hazan, 2012; Slatcher, Selçuk, & Ong, 2015). In other lines of work, I am interested in understanding the role of social and developmental factors in person perception (e.g., Günaydın, Selçuk, & Zayas, in press; Günaydın, Zayas, Selçuk, & Hazan, 2013), and factors affecting relationship development and mate selection (e.g., Günaydın, Selçuk, & Hazan, 2013). In the near future, I aim to extend my research program to investigating mechanisms (e.g., early life caregiving) underlying intergenerational effects of relationships on social development and well-being (see Selçuk, Günaydın, Sümer, Harma, Salman, Hazan et al., 2010 for initial early evidence and Slatcher & Selçuk, 2017 for recent theoretical discussion).