Services and terms

Professor Allen-Mersh can offer expert witness evidence. Get in touch today to discuss.

Find out more


View all of Professor Allen-Mersh’s experience and qualifications.

Find out more

Latest news

Keep up to date with all of the latest news and details. Get in touch today to find out more.

Find out more


Medical Expert Witness & Gastroenterology Specialist – Professor Tim Allen-Mersh

Professor Allen-Mersh is a medical expert witness specialising in medico-legal reports, and has more than 30 years’ experience in the surgical treatment of gastrointestinal and colorectal disorders such as:


  • Appendicitis
  • Diverticulitis
  • Inflammatory bowel diseases, for example Crohn’s disease or ulcerative colitis
  • Colorectal cancer
  • Haemorrhoid surgery
  • Rectal prolapse
  • Gastroscopy / Colonoscopy
  • Hernia (laparostomy, inguinal, incisional and umbilical)
  • Obstetric perineal/anal sphincter injury or tear
  • Emergency general surgery
  • Anastomotic leak
  • Inadvertent operative injury to the bowel, for example during caesarean section or hysterectomy
Medical Expert Witness Professor Tim Allen-Mersh