[Elena Ventzel][1] is not a very famous mathematician, although her textbook on Probability for engineers was (still is?) by far the most famous and widely used one in Russia.

She had a successful separate career as a fiction writer under a pen-name I. Grekova (derived from "igrek").


  [1]: https://www.ams.org/mathscinet/search/author.html?mrauthid=198874