Mr Mark Sullivan is a Consultant Urological Surgeon and Honorary Senior Lecturer at the Oxford University Hospitals NHS Foundation Trust and the University of Oxford, respectively. He was appointed Clinical Director of the Renal, Transplant and Urology Directorate at the Oxford University Hospitals NHS Foundation Trust in 2014. Mr Sullivan specialises in renal surgery with expertise in open, laparoscopic, and robotic surgery, as well as vasectomy reversal.

Mr Sullivan qualified from University College London in 1989 and trained in Surgery and Urology at Nottingham, Cambridge, London, and Oxford. He is an international authority on renal cancer and a leading UK surgeon offering open, laparoscopic, and robotic options for treatment. Together with David Cranston, he provides the renal autotransplantation service in Oxford, a nationally commissioned service. This unique service has allowed many patients in the UK to have complex renal cancers excised from either solitary or both kidneys, thereby avoiding dialysis in most cases. He is also a national authority on erectile dysfunction and offers specialist advice and management to patients.

Mr Sullivan's areas of expertise include circumcision, cystoscopy, kidney surgery, laparoscopic kidney surgery, robotic kidney surgery, orchidectomy, penile corrective surgery, prostate biopsy, prostate cancer diagnostics, prostatectomy (robotic), reconstructive surgery, renal surgery, robotic surgery, testicular ultrasound, vasectomy (male sterilization), and vasectomy reversal. He also specialises in andrology, blood in urine (haematuria), kidney cancer, male infertility, Peyronie's disease, testicular lumps and swellings, testicular pain, and urological cancers.

Mr Sullivan is dedicated to providing the highest standard of care to his patients, utilising the latest surgical techniques and technologies to ensure the best possible outcomes.