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In page Joseph O'Doherty:

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In 1918, O'Doherty married Margaret (Mairéad) Claire Susan Irvine (1893–1986), the same year she graduated as a medical doctor. She was born in Maguiresbridge, County Fermanagh. She studied medicine [where?] and after marrying O'Doherty, was appointed Chief Medical Officer of Derry, a post she occupied from 1919 to 1921, during the last year working without pay because she refused to take the Oath of Allegiance Oath of Allegiance (Ireland) to the English King George V.