In 1978, she joined the Royal Shakespeare Company, working alongside Juliet Stevenson in Measure for Measure, as Jaquenetta opposite Michael Hordern in Love's Labours Lost, replacing Zoë Wanamaker as Jane in The Way of the World[9] and appearing in the Howard Brenton three-hander Sore Throats.[10] While at the RSC, Wax also met and befriended Ian Charleson, and later contributed a chapter to the 1990 book, For Ian Charleson: A Tribute.[11] In 1981, Wax appeared as an American track fan in Charleson's breakthrough film, Chariots of Fire.[12]