Robin Warren is distinguished for the discovery of Helicobacter pylori, the bacterium that causes a range of gastric disorders, including peptic ulcers, gastritis and gastric cancer. Persisting in the face of scepticism and setbacks he and Barry Marshall demonstrated how H. pylori was able to survive in stomach acid. Their research has resulted in effective treatments for a variety of gastric ailments, sparing thousands of people world-wide a lifetime of pain and distress.