Steffi Grant was born December 1 in 1923, in Berlin. After marrying former Crowley secretary Kenneth Grant in 1948, she would provide most of the artwork illustrating the many books he produced during his lifetime.
Sadly there is not much information about her to be readily found online. There are some mentions in this Fulgur thumbnail:
https://fulgur.co.uk/artists-and-writers/kenneth-steffi-grant/.
Thank you. I get more out of Steffi Grant’s art than Kenneth Grant’s books. I wish more of it were generally available.