Colvin was consultant haematologist at St Peter's Hospital and Institute of Urology 1977-86, and at Barts and the London Hospital 1977-2009. He was director of postgraduate medical and dental education at the Royal Hospitals NHS Trust, London 1996-99, and Dean of Queen Mary's School of Medicine and Dentistry 1998-2008. He has been appointed honorary professor at Queen Mary College. He was director of the company Clinical Pathology Accreditation Ltd 1998-2004, and since 2008 has been medical director (haemophilia) at Pfizer Europe.
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