Specialising in emergency medicine Professor Redhead was first appointed as a consultant at Ealing Hospital in 2000. He joined Imperial College Healthcare NHS Trust full time in 2004 and became chief of service for emergency medicine in 2008.

Since then he has held various roles including clinical programme group director for medicine, divisional director for investigative and supporting sciences, associate medical director for professional development and interim chief executive.

Professor Redhead is currently also medical director of the Fortius Clinic, trustee to the Royal Society for the Prevention of Accidents, secretary to the British Association of Immediate Care for London and a Care Quality Commission specialist adviser.