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Born in Mitchellville, Iowa
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Graduation from Grinnell College
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Worked on Manhattan Project
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Begins work on uranium and lead dating in zircon crystals
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Receives Ph.D from University of Chicago
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Begins career at CalTech
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Determines the age of the earth
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Trips to ice caves in Antarctica and Greenland
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Tries to bring public's attention to danger of lead poisoning
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Excluded from National Research Council panel on atmospheric lead contamination
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Leaded gas begins to be phased out
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Death in California
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Lead levels in humans decreased by 80%