My core research interest is the meaningful aggregation of information over people, over time and over dimensions to measure socioeconomic concepts including poverty, inequality and wellbeing.  The broad objective of my theoretical work is characterisation of aggregate measures on the basis of clear intuitive ethical principles and empirical regularities.  My empirical work focusses on applications in low and middle income countries: I am currently involved with projects in Tunisia (measuring women's empowerment in a way that respects subjects' perceptions) and in Kenya (examining the distributional impact of a programme of targeted cash transfers).