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Thomas Edvard Krogh
Thomas Edvard ''"Tom"'' Krogh, FRSC (1936 – April 29, 2008) was a geochronologist and a former curator for the Royal Ontario Museum. He revolutionized the technique of radiometric uranium-lead dating with the development of new laboratory procedures and analytical methodologies. His discoveries have yielded an unprecedented level of precision in the dating of Precambrian rocks. Krogh's techniques have become the international de facto standard. The application of these techniques has provided a detailed understanding of the evolution of the Earth's Precambrian shield areas.
==Education==
Krogh was born in Peterborough, Ontario. Between 1955 and 1959, he studied geological engineering at Queen's University and held several jobs. For the first two summers he worked as a Geological Assistant at Noranda Mines and Triana Explorations, respectively. Between 1957 and 1959, he worked as a Teaching Assistant at the university. In 1958, he supported the Geological Survey of Canada as a Geological Assistant. In 1959, he was a Senior Assistant for the Ontario Department of Mines. Krogh obtained a MSc in geology from the university in 1960. He left Canada to study at the Massachusetts Institute of Technology, where he continued to work whenever he was not studying. His first job was as a Teaching Assistant in Mineralogy, then as a Geologist at Cominco, then as a Research Assistant in Geochronology. In 1964, he obtained his PhD in geochronology.
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