Christa was appointed as a fee paid Employment Judge in 1995. She became a salaried Employment Judge in 2003, assigned to sit in the Employment Tribunal in Exeter and then Bristol. She was Director of Training for Tribunals for the Judicial College, Editor of the Tribunals Journal between 2016 and 2020 and Deputy Director of Training for the Employment Tribunals (E&W) between 2009 and 2016.

Christa continues to sit as an Employment Judge and was also assigned to sit in the Mental Health Tribunal in the Health, Education and Social Care Chamber in 2020. 

Christa qualified as a solicitor in 1984 and specialised in company and commercial work. She combined work in private practice and as a lecturer at the University of Bristol and the University of the West of England until her appointment as a salaried judge in 2003.