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Barry Marshall is an Australian physician and Nobel laureate known for his groundbreaking discovery that linked stomach ulcers to the bacteria Helicobacter pylori. Born on September 30, 1951, in Kalgoorlie, Western Australia, Marshall studied medicine at the University of Western Australia. In 1984, he and his colleague Robin Warren identified H. pylori as the cause of most stomach ulcers, challenging the prevailing belief that ulcers were primarily caused by stress. This discovery revolutionized the field of gastroenterology and led to new treatments for ulcers. In 2005, Marshall received the Nobel Prize in Physiology or Medicine for his work. He continues to research infectious diseases and is dedicated to improving global public health.