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

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 achievement 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 recognised 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, she further specialised in early phase translational drug development within the Guy’s Cancer Early Phase Clinical Trials Unit. She was also appointed Advanced Therapies Medicinal Products (ATMP) Clinical Lead for the Trust and Solid Tumour Cell Therapy Lead. Additionally, she is an Honorary Senior Lecturer at King's College London, where she continues to supervise PhD students.

Dr Josephs' areas of expertise include prostate cancer, early phase clinical trials, translational cancer immunology, and advanced therapies medicinal products. Her roles encompass clinical leadership, research supervision, and the development of innovative cancer treatments. She is deeply committed to advancing the field of oncology through both her clinical practice and research endeavours.