Zarnie is a health services researcher, with a BSc and MSc in Health Sciences from the University of York and a PhD in Primary Care and Population Health from University College London. Her expertise is in digital health research and implementation science. Zarnie's research is funded by a Cancer Research UK Career Establishment Award (2024-2030), to improve uptake of digital weight-management interventions. Her career to date has focussed on the development, evaluation and implementation of digital interventions for supporting people with reducing their alcohol intake. Zarnie has funded her training and research through project grants and personal fellowships, i.e. MRC Studentship, NIHR School for Primary Care Research Fellowship and King’s Improvement Science Fellowship. 

Over the past 15 years, Zarnie has led Randomised Controlled Trials to explore the effectiveness of digital alcohol interventions in workplace settings, systematic reviews on the effectiveness of digital alcohol interventions, psychometric studies on the validity and reliability of an online measure of past week drinking, observational research using data from electronic health records on the impact of financial incentives on alcohol screening in primary care, and qualitative research exploring people’s experiences of seeking help online. Most recently, her research has focussed on the implementation of digital interventions in NHS settings, using validated implementation outcome measures.

Zarnie developed the multi-institution, online postgraduate module – An Introduction to Implementation Science, also delivered as a short course hosted by King’s College London.  She contributed to the development of the ImpRes tool and guide to designing implementation research https://pubmed.ncbi.nlm.nih.gov/31412887/ Her systematic review of implementation outcome instruments used in physical healthcare settings https://pubmed.ncbi.nlm.nih.gov/32811517/ was used to create a web-based repository of measures to support implementation researchers in identifying validated instruments https://implementationoutcomerepository.org/.