Mario L. Small, Ph.D., an elected member of the American Academy of Arts and Sciences, the American Academy of Political and Social Sciences, and the Sociological Research Association, is an expert on urban poverty, social inequality, personal networks, and the relationship between qualitative and quantitative methods. His latest books are Someone To Talk To: How Networks Matter in Practice and Personal Networks: Classic Readings and New Directions in Egocentric Analysis. Small is currently studying the relationship between networks and decision-making, the ability of large-scale data to answer critical questions about urban inequality, and the role of qualitative inquiry in cumulative social science.