Catherine trained to registrar level in Medical Oncology before qualifying as a GP in 1995. She completed a Fellowship in Integrative Medicine at the University of Arizona in 2010. In addition to her role at Penny Brohn UK, Catherine works part-time as an NHS GP and is an Honorary Clinical Lecturer at University of Bristol. She was a GP Clinical Cancer Lead for Bristol, North Somerset and South Gloucestershire CCG for 5 years.