Dr. Debra Josephs is a Consultant Medical Oncologist specialising in the treatment of prostate cancer. She earned a first-class intercalated BSc as part of her medical training at the University of Edinburgh. Following completion of core training in internal medicine, she undertook specialist training in Medical Oncology at Guy's and St. Thomas' NHS Foundation Trust.

In 2009, Cancer Research UK awarded Dr. Josephs a clinical research fellowship, enabling her to complete a PhD in translational cancer immunology at King's College London in 2013. This led to her being offered an Academic Clinical Lectureship at Guy's and St. Thomas' and King's College London, where she conducted clinical and translational research. She has been recognized with numerous awards, including the Sylvia Lawler Oncology Prize from the Royal Society of Medicine and the McElwain Prize in Medical Oncology from the Association of Cancer Physicians.

In 2017 Dr. Josephs was appointed as a Consultant in Medical Oncology at Guy's and St. Thomas', where she serves as Joint Lead Clinician for Prostate Cancer. In 2022 Dr Josephs also specialised in early phase translational drug development within the Guy’s Cancer Early Phase Clinical Trials Unit, and was appointed Advanced Therapies Medicinal Products (ATMP) Clinical Lead for the Trust as well as Solid Tumour Cell Therapy Lead. She is also an Honorary Senior Lecturer at King's College London, where she continues to supervise PhD students.