Margot Zemach
November 30, 1931 – May 21, 1989 (aged 57)
Birth place: Los Angeles, California, USA
Zemach may have retained "Zemach, Margot" as her legal name after marriage but these sources do not say that:
[added by editor Pwendt 2015-12-18]: Her NYTimes obituary 1989-05-23 also spells her husband's surname "Fischtrom". It covers her as "Ms. Zemach" and closes with "four daughters, Heidi, Rachel, Rebecca and Kaethe Zemach-Bersin, and two granddaughters". Kaethe Zemach (professional name, perhaps sometime legal name) is a children's writer and illustrator under that name (c) 1979 and 2004. She wrote at least one book as by "Kaethe Zemach-Bersin", published 1988. Source LCCN