Tomás R. Jiménez, Ph.D. is an assistant professor of sociology at Stanford University. He is also a Fellow at the Center for Social Cohesion. His research and writing focus on immigration, assimilation, social mobility, and ethnic and racial identity. His book, Replenished Ethnicity: Mexican Americans, Immigration, and Identity (University of California Press, 2010) draws on interviews and participant observation to understand how uninterrupted Mexican immigration influences the ethnic identity of later-generation Mexican Americans.