Andrés is the Regional Expert in Social Statistics at the ECLAC Statistics Division, where he offers advice and assistance to National Statistical Offices and other institutions within the National Statistical Systems of beneficiary countries. His work focuses on social statistics, survey methodology for household surveys, and small area estimation models, with particular emphasis on the Sustainable Development Goals monitoring framework. He currently serves as Vice-President of the International Association of Survey Statisticians. Andrés has authored several books, papers, and software related to survey sampling, small area estimation, Bayesian statistics, and statistical inference.