This encouraged Webb to consider a career in the same field and, after consultations with his friend, he applied for a job at the Royal Marsden Hospital.
He then moved on to research in nuclear medicine, with one of the hospital's first PET scanners (named MUPPET) housed in a freight container on a lorry in the car park.
[3] Arguably, Webb's most important work was on radiation therapy and included treatment planning and intensity-modulated and image-guided radiotherapies.
[3] In 1996 Webb was granted a professorship at the Royal Marsden and two years later he became head of the Joint Department of Physics.
[7] In addition, he was awarded the degree of DSc (Med) Honoris Causa by the University of London.