Alexis is a medical ethicist and sociologist. Her work examines areas of ethical concern in medicine, with a focus on health inequality, patient safety, decision-making in medicine, and healthcare improvement. She is an expert in medical ethics, medical sociology and social epidemiology. She does practical research designed to improve health policy and practice. She has expertise in several topics within these disciplines, including COVID-19 ethics, pandemic public health, the impact of COVID-19 on BAME groups, health inequalities and the social determinants of health and illness. She is the Chair of the Committee on Ethical Issues in Medicine for the Royal College of Physicians and a Trustee of the Institute of Medical Ethics.