John Gregorson Campbell

John Campbell may refer to: == Academia == John Francis Campbell (1821–1885), scholar of Celtic folklore and language; inventor John Edward Campbell (1862–1924), mathematician credited for the Campbell-Hausdorff formula John Lorne Campbell (1906–1996), Scottish historian, farmer, environmentalist, and folklore scholar John R. Campbell (1933–2018), American dairy scientist and university administrator John Campbell (casting scientist) (born 1938), British engineer John Angus Campbell (born 1942…