Ian began his career as a Medical Physicist in 1989, working at the Hammersmith hospital, London.
Since 1998 he has worked almost exclusively in the field of SRS, being responsible for over 8,000 patient treatments and has helped start up over 100 centres worldwide. He is considered a world authority on treatment plan metrics, having formulated the Paddick Conformity Index and the Gradient Index.
In 2003, Ian became a freelance physicist and set up Medical Physics Limited; a group of physicists providing expert radiosurgery physics services to SRS centres in the UK, Europe and the USA, as well as industry.
Ian is currently on the faculty of five SRS centres; Queen Square, London, GenesisCare at Cromwell, London, London Gamma Knife Centre, Thornbury Radiosurgery Centre, Sheffield and St. Elisabeth Hospital, Tilburg, Netherlands.
He was the first physicist to serve as President of the International Stereotactic Radiosurgery Society (ISRS) and received Fabrikant Award for his contribution to SRS.
He currently serves as Past-President to the British Radiosurgery Society and Chair of the ISRS Certification Committee.