Mr Hussain Alnajjar is a subspecialised consultant urological surgeon and andrologist based in central London. He is an honorary associate professor at UCL. He is an expert in all conditions related to men's health (andrology) including male infertility (microsurgical sperm extraction, vasectomy and its reversal), penile prosthesis surgery for erectile dysfunction, Peyronie’s disease, priapism, male genital cancer hypogonadism (low testosterone) and priapism. He also sees patients with all general urological conditions.

He is fully trained in all disciplines of urology and andrology. Having completed pre-clinical medicine at St Andrews University, Mr Alnajjar qualified with a medical degree from University College of London in 2005. This was followed by a Masters surgical degree in urology from the University of Edinburgh, with distinction. Mr Alnajjar accomplished an advanced fellowship in surgical andrology and genito-urethral oncology at the renowned specialist andrology unit at University College London Hospitals, further refining his skills in all aspects of male health. Mr Alnajjar is dually qualified as a fellow of both the Royal College of Surgeons of England and the European Board of Urology.

Mr Alnajjar has contributed greatly to clinical research with more than 100 peer-reviewed publications and 14 book chapters, including a chapter in the Oxford Handbook of Urology and 2 textbooks in the field of andrology. He is also an MRCS examiner for The Royal College of Surgeons of England, and a member of the European Board of Urology examination committee. Mr Alnajjar has won distinguished accolades several times for his clinical and academic achievements.