There are two main themes to Paul’s work: 1) developing measures of happiness and subjective wellbeing that can be used in policy and by individuals looking to be happier; and 2) considering ways in which the lessons from the behavioural sciences can be used to understand and change individual behaviour, and to add to the evidence base in this regard. He uses a range of data and methods to address these issues, and to better integrate them e.g. surveys, big data, lab studies, and field experiments.