Jonathan Knowles, MD, joined Columbia University Irving Medical Center/New York Presbyterian Hospital from the Royal Free Hospital, London. He works collaboratively with Dr Pokala Ravi Kiran in the management of simple, complex and complicated colorectal conditions.

Dr. Knowles completed his medical training at Oxford University and the University of London, qualifying with honors. He did 4 years of basic surgical training in London and then a research position on colon cancer cellular interactions at University College London, being awarded a Masters in Surgical Science with Distinction. He then completed 7 years of higher surgical training in the United Kingdom with a speciality interest in Colorectal Surgery leading to a Fellowship of the Royal College of Surgeons in 2012.

Dr. Knowles underwent further training at the Peter MacCallum Cancer Institute, Melbourne in recurrent rectal and anal cancer with the complex pelvic cancer team and in colorectal carcinomatosis using surgery and intra-operative chemotherapy with the peritoneal cancer unit. He also did a fellowship in complex abdominal surgery at St Mark's Hospital London, the leading colorectal specialty hospital in the United Kingdom. In 2015, he was a visiting surgeon at the Ecole de Chirurgie in Paris, learning techniques in advanced minimally invasive surgery.

Since 2013, Dr. Knowles has been working as an attending surgeon at the Royal Free Hospital, London. He has been Division Chief of Colorectal Surgery and Clinical Lead for the Colorectal Cancer Unit at the Royal Free Hospital, London since 2017. He has also been a member of the international unit for the treatment of neuroendocrine (NET) cancers. He has given several presentations at the national and international level and has published several articles and a book chapter on Colorectal Surgery.

Dr. Knowles is well versed in anorectal procedures, and in minimally invasive and open abdominal surgery. He has a special interest in the management of colorectal cancer and neuroendocrine tumors.