Kay was the Project Manager for the 2007 Caudwell Xtreme Everest expedition, and led the 2009 Caudwell Xtreme Everest expedition, both research projects of CASE medicine. When not working on these expeditions, Kay manages the Cardiopulmonary Exercise Testing Laboratories at University College Hospital and the Whittington Hospital. She continues to handle the finances of a number of research projects. Finally, she works part time as a nurse in intensive care.
Kay studied at the Oxford School of Nursing before attending UCL (University College London) where she completed her Human Sciences degree with honours. She then joined Midland Bank on a Graduate Management Programme, and worked as a Customer Services Manager at a large London branch. Since returning to nursing, Kay has worked as an Intensive Care nurse at University Hospitals NHS Trust in London, and more recently as the Intensive Care teaching Sister at Homerton University Hospital NHS Foundation Trust. She completed a MSc at Imperial College London in Adult Critical Care in 2007.