Dr John Glees is a Consultant Clinical Oncologist specialising in radiation therapy and chemotherapy treatments for a wide variety of cancers. He is a Fellow of the Royal College of Radiologists UxK and holds an M.D. with Honours, having completed a thesis on brain tumours.

Dr Glees received his training in England, Germany, and the United States. He gained his initial radiotherapy experience in the United States, working with Dr Irwin Tepper. In 1971, he returned to the UK and was appointed to the Royal Marsden Hospital. He held a joint Consultant post at St George's University Hospital in London and The Royal Marsden Hospital. Additionally, he served as an Honorary Senior Lecturer at the University of London from 1981 to 2010.

Dr Glees specialises in the treatment of lung cancer, breast cancer, skin cancer, upper and lower gastrointestinal (G.I.) cancers including pancreatic, rectal, and anal cancer, as well as gynaecological and urological cancers such as kidney, bladder, and prostate cancer.

Dr Glees is highly skilled in treating the following conditions:

- Lung cancer
- Breast cancer
- Skin cancer
- Upper and lower G.I. cancers (pancreatic, rectal, and anal cancer)
- Gynaecological cancers
- Urological cancers (kidney, bladder, and prostate cancer)

Dr Glees has been dedicated to advancing cancer treatment since his appointment in 1971, bringing a wealth of experience and knowledge to his patients. His commitment to oncology and his extensive training make him a leading specialist in his field.