My research is focussed on using epidemiological methods to address key policy-relevant etiological questions relating to ill-health in pregnancy and fertility, using both interventional and observational designs, mainly but not exclusively in high-income countries.

Through my affiliation with CeFH in Norway, I have researched pressing issues in perinatal epidemiology using the exceptional national routine data linkages available. Since 2020 I have had a key role in a Scandinavian collaboration looking at Covid-19 and pregnancy (Nordforsk-funded SCOPE 1 and 2 projects) which has been at the forefront of addressing knowledge gaps about Covid-19 and pregnancy. I am a named collaborator on a Research Council of Norway funded programme of work looking at assisted conception and cancer risk, for which I am leading registry-based analyses.

I am involved in the British National Surveys of Sexual Attitudes and Lifestyles (Natsal), currently co-leading the Reproductive Health working group for Natsal-4.

I am the lead epidemiologist for a programme of work on pregnancy in women living with sickle cell disease, and I was co-investigator for a recently completed NIHR-funded feasibility RCT assessing treatment options for this population.

I have a long-standing interest in the socio-economic determinants of breastfeeding in low-, middle- and high-income countries.