Sergi is a sociologist and a social demographer (PhD), currently appointed as an Associate Professor at the Department of Sociology, and acting as a head of the Generations and Life Course research group in the Centre d'Estudis Demogràfics (CED) at the Universitat Autònoma de Barcelona.

He has substantive expertise in several fields of demographic research –particularly family dynamics and spatial mobility– and social inequality research. His research adopts life course and cross-national approaches, and uses state-of-the-art quantitative methods for the analysis of longitudinal data.

Sergi is an ERC Grant holder, currently leading the LIFELONGMOVE project funded by the European Research Council (Consolidator Grant, 2023-2027). He is the (co-)chair of the IUSSP Scientific Panel on Lifetime Migration of the International Union for the Scientific Study of Population (2023-2025). He is also a Life Course Centre affiliate of the ARC Centre of Excellence for Children and Families over the Life Course, a BiB fellow of the German Federal Institute for Population Research, and an ICREA Acadèmia award recipient (2023-2027).