Angel is a Health Psychologist and Sport and Exercise Psychologist, registered with the Health and Care Professions Council (HCPC) and Chartered with the British Psychological Society (BPS). 

Her research, teaching, training and practice centres around the interplay between health psychology and public health. With a career that has spanned over 20 years in health psychology, Angel's expertise focuses on optimising health and wellbeing through behaviour change interventions and ‘moving medicine’. Specifically, her research applies behavioural science to understand and intervene with factors that influence behaviours that impact on health, illness and the health care system. It spans multiple populations (children, adults, health professionals), behaviours (physical activity, eating behaviour, medication use, health care communication), experiences (death, food insecurity), and health outcomes (obesity, diabetes, cardiovascular disease, anxiety, depression), with the connecting thread being the application of health psychology to optimise physical health and psychological wellbeing. 

Angel has authored over 170 peer-reviewed publications and reports, and has been awarded over £5million in research income, extending pragmatic science in areas such as physical activity and sedentary behaviour interventions, obesity and diabetes prevention and treatment, health professional prescribing and referral behaviour, medication adherence, parental bereavement, and the application of the Behaviour Change Wheel in real-world practice. 

She co-founded the Health Psychology in Public Health Network (HPPHN), which during her term as Chair, became the Behavioural Science and Public Health Network (BSPHN), hosting a national strategy that promotes the role of health psychology and behaviour change in improving population health and wellbeing. She is the Past Chair of the BPS Division of Health Psychology (serving as Chair 2019-2021), co-founder of the Health Psychology Exchange (HPX) and the Health Psychology Trainee Network (HPTN), leads the BPS COVID-19 Behavioural Science and Disease Prevention Taskforce and was the UK National Delegate for the European Health Psychology Society (EHPS) from 2011-2018. In these roles, Angel has promoted professional identities, and supported networking, research, practice and mentoring opportunities. She has co-produced evidence-based policy briefings using the Behaviour Change Wheel approach, and championed funded training and career pathways in applied health psychology, co-producing recruitment materials that have been shared with international colleagues to advocate for roles in their respective countries. 

Angel first joined UCL in 2012, situated in the Centre for Behavioural Medicine within UCL's School of Pharmacy. She left in 2016, to return to the University of Bedfordshire where she went on to develop the Centre for Health, Wellbeing and Behaviour Change, within the Institute for Sport and Physical Activity Research (ISPAR). 

In 2022 Angel re-joined UCL as the Co-Director of the Centre for Behaviour Change (CBC), which she has been affiliated to since its inception, contributing annually to the international training programme, bespoke training and consultancy. She joins UCL from her role as Director of ISPAR and Professor in Health Psychology and Behaviour Change at the University of Bedfordshire, which she will continue on a fractional basis.