John Johnston O'Neill
John Johnston O'Neill (November 12, 1886 – June 1, 1966) was a Canadian geologist and academic. Born in Port Colborne, Ontario, the son of Thomas John O'Neill, an Irish immigrant, and Mary Jane Henderson, O'Neill received a Bachelor of Science and Master of Science degrees in geology and mining from McGill University in 1909 and 1910. He earned a Ph.D. in structural geology and petrography from Yale University in 1912. From 1912 to 1913, he did postdoctoral work at the University of Wisconsin.O'Neill worked for the Geological Survey of Canada from 1909 to 1913 and from 1914 to 1920. In 1913, he spent a year as a geologist on Vilhjalmur Stefansson's Canadian Arctic Expedition.