Dr Gaya qualified at St George's Hospital Medical School (University of London) in 1995, where he was awarded a distinction and several academic prizes. He trained in Clinical Oncology at Imperial College and St Bartholomew's Hospital and subsequently undertook a Cancer Research UK MD Fellowship at University College London.

Dr Gaya treats gastrointestinal tumours using chemotherapy, radiotherapy, immunotherapy and biological therapy ' His focus is on colon, rectum & anal cancer, cancers of the oesophagus, stomach, biliary system, pancreas, liver and skin cancers. Dr Gaya's main research interests are in the areas of functional cancer imaging, and immunotherapy of cancer. He is researching ways to assess response to treatment much earlier and also boosting the immune system to fight cancer.

He is heavily involved with the implementation of the latest radiotherapy techniques such as IMRT, IGRT and Tomotherapy, and stereotactic body radiosurgery. He was one of the first UK doctors to use the CyberKnife unit. He has published widely in peer-reviewed journals.

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