Meigs was born in Philadelphia, the daughter of Edward Browning Meigs and Margaret Wister Meigs, and grew up in Washington, D.C. Her great-great-grandfather was the famous obstetrician Dr. Charles Delucena Meigs, and her great-granduncle was Major General Montgomery C. Meigs, Quartermaster General of the United States Army during the American Civil War.
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Atwater is the son of noted avalanche control pioneer and author Montgomery Atwater; the grandson of Maxwell Atwater, the first mining engineer to employ flotation hydrometallurgy in North America; and the grandson of Mary Meigs Atwater, the ‘Dean of American Hand Weaving’.