What is Barry Marshall?
{{Infobox Scientist |box_width = |name = Barry Marshall |image = Barry Marshall 2008.jpg |image_size = 220px |caption = Barry Marshall |birth_date = {{birth date and age|1951|09|30|df=yes}} |birth_place = [[Kalgoorlie, Western Australia]] |death_date = |death_place = |residence = |citizenship = [[Australia]]n |nationality = |ethnicity = |fields = [[Medicine]]: [[Microbiology]] |workplaces = [[University of Western Australia]] |alma_mater = |doctoral_advisor = |academic_advisors = |doctoral_students = |notable_students = |known_for = ''[[Helicobacter pylori]]'' |author_abbrev_bot = |author_abbrev_zoo = |influences = |influenced = |awards = 2005 [[Nobel Prize in Physiology or Medicine]] |religion = |signature = <!--(filename only)--> |footnotes = }} {{Nobelprize|Physiology or Medicine}}'''Barry James Marshall''', [[Order of Australia|AC]], [[Royal Society|FRS]], [[Australian Academy of Science|FAA]] (born 30 September 1951) is an [[Australia]]n [[Medical doctor|doctor]] and winner of the 2005 [[Nobel Prize in Physiology or Medicine]]. He is Professor of Clinical Microbiology at the [[University of Western Australia]]. Marshall is well known for proving that [[bacteria]] ''[[Helicobacter pylori]]'' are the cause of most [[Peptic ulcer|stomach ulcers]]. This changed years of medical belief which said that ulcers were caused by [[Stress (medicine)|stress]], spicy foods, and too much acid. He took a part-time position at the [[Pennsylvania State University]] in 2007.<ref>{{cite web | title =Nobel laureate Marshall joins Penn State faculty | url =http://live.psu.edu/story/25683 | publisher =Penn State Live | date =2007-09-06 | accessdate =2007-09-06 | archive-date =2011-08-25 | archive-url =https://web.archive.org/web/20110825202825/http://live.psu.edu/story/25683 | url-status =dead }}</ref> ==Early years