Cressida is a College Lecturer at Corpus Christi College, where she teaches Contract and Constitutional Law. She is also the Graduate Teaching Assistant for Medical Law and convenor of the Medical Law Discussion Group. She was previously a lecturer at Merton College teaching Tort Law, and continues to teach Tort and Constitutional Law for other colleges. 

Cressida's doctoral thesis, entitled 'The cusp of capacity: empowering and protecting people in decisions about treatment and care’, considers the robustness of the concept of capacity in law, and the appropriate legal treatment of people who are found to lack legal capacity. Her research is funded by the Arts and Humanities Research Council (AHRC). 

Before starting her DPhil, Cressida read Jurisprudence (Law) at Merton College, Oxford, did a Masters in Medical Law and Ethics at King’s College, London, and taught both Medical Law and Company Law at the London School of Economics (LSE). She was also a Postgraduate Research Fellow at the Parliamentary Office of Science and Technology.