Question: When is Willard D. Morgan's wife's birthday?
Sentence (from "Willard D. Morgan"): Willard "Herc" Detering Morgan (born May 30, 1900 in Snohomish, Washington- September 18, 1967 in Bronxville, New York) was a photographer, writer, editor, and educator and the husband of photographer Barbara Morgan, known for her documentation of Martha Graham's dances.
Relevant evidence: Yes