His main research focus is on multi-language acquisition and its effects on cognitive development from infancy to older age. His research project, ‘Raising bilingual children: the effects of exposure to a bilingual environment on cognitive development in infants’ was funded by a British Academy/Leverhulme Small Research Grant. He is also the Director of the Multilanguage and Cognition Lab (MULTAC), part of the Centre for Language, Literacy & Numeracy at UCL, Institute of Education.