Maurice Crowther Hall (Marion's father) was chief of the zoology division of the National Institute of Health, research unit of the Public Health Service. Among his discoveries was the cure for hookworm.
From The Literary Digest, Nov. 1, 1927
Caption: 'He tried it on the dog first: Dr. Maurice C. Hall found he could kill Rover's hookworm with a dose of fire-extinguisher [carbon tetrachlorid], but when he tried it on a rabbit, Bunny died. Would it kill a man? Dr. Hall found out by swallowing a dose himself."
The Washington Post, Aug. 26, 1938
The Washington Post, June 11, 1930
The Washington Post, July 22, 1928
Novel by Dr. Hall, illustrated by his daughter Marion
Bookplate by Marion
Maurice; his wife Lola Davis Hall; and his parents, George Hemingway Hall and Marion Crowther Hall, circa 1917.
Samples of the publications by Dr. Hall that can easily be found on the Internet by searching "Maurice C. Hall":