Joseph W. Greig

Joseph W. Greig (1895–1977) was an American geochemist and physical chemist, a pioneer in high temperature phase equilibria and immiscibility investigations of oxides and sulfides. His name has been assigned to a new magnetic mineral, greigite. discovered in 1964. Nine minerals have been named after him.

Joseph W. Greig studied geology and mineralogy at Queen's University before going on to graduate work at Columbia University before he received his Ph.D. from Harvard and then worked at the Carnegie Institute for thirty-eight years. Once he retired in 1960 he became a visiting professor at Pennsylvania State University. He also served in the World War I with the Canadian Expeditionary Force, and in the second with the United States Bomber Command in the Pacific Theatre.