# Alexandra A. Killewald ## expand\_more [### David Arbeláez ](/people/david-arbelaez) Doctoral Student in Sociology & Social Policy Research Interests: Inequality, intergenerational mobility, organizations, higher education David Arbeláez is a PhD student in the Sociology and Social Policy PhD program at Harvard University. He is generally interested in income and wealth outcomes as... ![David Arbelaez](/sites/g/files/omnuum1481/files/styles/hwp_4_5__690x865/public/sociology/files/arbeleaz_david_photo.jpg?itok=QiOwspoV) [### Nino José Cricco Doldan ](/people/nino-cricco) Doctoral Student in Sociology Research Interests: Immigration, Inequality and Stratification, Family, Labor Markets, Social Demography, Quantitative Methods Nino José Cricco is a PhD student in Sociology. His research interests include immigration, economic inequality, and family... ![Nino Cricco](/sites/g/files/omnuum1481/files/styles/hwp_4_5__690x865/public/sociology/files/cricco.jpg?itok=jCnmA-I-) [### Brian Xiao ](/people/brian-xiao) Doctoral Student in Sociology Research Interests: social demography, families, wealth, population health, quantitative methods, survey methods Brian Xiao (pictured right) is a PhD candidate in Sociology and Doctoral Trainee in Demography and Population Sciences at the Harvard Center... ![Brain Xiao and Dave the cate](/sites/g/files/omnuum1481/files/styles/hwp_4_5__690x865/public/2025-03/Brian%20Ziao.jpg?itok=tERwlo3C) [### Zehra Yildirim ](/people/zehra-yildirim) Doctoral Student in Sociology Research Interests: Demography, fertility, migration, gender, and social stratification Zehra Yildirim is a doctoral student in sociology. Her research interests include demography, fertility, migration, gender, and social stratification. In graduate... ![Zehra Yildirim](/sites/g/files/omnuum1481/files/styles/hwp_4_5__690x865/public/sociology/files/yildirim_zehra_june_2019.jpg?itok=Jy-z3e8P)