Peter Cartwright has 20 years experience of working for patient and self-help associations, as Assistant Director of the National Association for Colitis and Crohn's Disease, Director of the British Stammering Association and National Development Officer of the Self-Help Alliance. He is a Trustee of the Bladder & Bowel Foundation. Peter has an MSc in Microbiology and an MA in Sociology. He is the author of three books for the general public on intestinal health, two of them for Sheldon. He has given over 40 lectures on DD and on probiotics to doctors in 10 countries.