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Elli Shor (Alla Smukler) received mathematical education and PhD degree from Moscow University. For many years she taught mathematics, first at Moscow and then at Israel, to engineering students and pre- and in-service maths teachers. Now, retired, she divides her time between reading and writing books, and caring for cats, at home and in the neighbourhood.
Clara Ziskin was certified in teaching mathematics by the University of Latvia. She taught mathematics in different institutions in Israel, including 35 years teaching in Haifa University Pre-Academic Studies Department. Now she is a maths lecturer at Academic College. In her spare time, she travels outdoors, engages in ceramics and enjoys the proximity of her grandchildren.