Cannon's contemporaries included Peter Falk, Geraldine Page, Sandy Dennis, Maureen Stapleton, Anne Meara and Jerry Stiller.

[citation needed] She was subsequently invited by George Devine to teach master workshops at The Royal Court Theatre.

Notable students included Jennie Buckman,[3] Ann Pennington, Emma Relph, Angelique Rockas, and Annabel Brooks.

[4] Hiring Cannon was a major shift in the training at RADA - after 80 years, this was the first time they decided to embrace the Stanislavski technique of Method.

[citation needed] At the Royal Academy of Dramatic Art she trained such actors as Michael Sheen, Adrian Lester, Indira Varma, Matthew Macfadyen and Ioan Gruffudd.