St. John graduated in 1976 from the Goodman School of Drama of the Art Institute of Chicago.
She further studied at Sorbonne University and with Atelier Blanche Salant and Paul Weaver at The American Center for Art and Culture in Paris, from 1976 to 1977.
In 2014, she wrote and performed her one-woman play Bette Davis on The Edge.
[2] She gave a one-off benefit performance of her play at Zuma Museum, Addis Ababa, Ethiopia, for her friend Meseret Yirga and in support of The Meseret Yirga Centre.
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