Professor Crosnoe's main research area is the educational success and healthy development of children, adolescents, and young adults in the U.S. Drawing on both quantitative and qualitative methods, he studies the connections among the academic progress, physical health, and social functioning of young people in different family and school contexts and how these connections play a role in broader inequalities related to social class and immigration. Specific topics of study are high school peer contexts; early child care and early childhood education; Mexican immigrant families; obesity; substance use; family-school partnerships; STEM coursework; family structure and parenting; and school, family, and peer influences on academic achievement.