Rhiannon graduated from the Guildhall School of Music and Drama in 1995.

She acted with and was a director of The Lab from 1997 to 2001, during which time the group created and produced The Woman Who Swallowed a Pin. The play was in the top ten critics choice shows for 2000 in the Observer and TimeOut.

"...the theatre of the future..."
Susannah Clapp ,The Observer on "The Woman Who".

Theatre includes: Costanza/The Queen, in Peribanez at The Young Vic; Conchita, in The Elixir of Love at English National Opera; Samantha, in Never Never Land at BAC; Isabelle in The Woman Who Swallowed a Pin; Bellinda in The Provoked Wife at the Mercury Theatre, Colchester; and leading roles in The Man of Destiny, and Annajanska, the Bolshevik Empress (Wimbledon); Heartbreak House (Shaw's Corner); The Threepenny Opera (Pimlico Opera) and Lady from the Sea (Bridewell). She created the role of Arial in Prospero's Children for the award winning Quicksilver Touring Theatre. Film and TV: The Space Between Sky and Sea, and David's Dream (Verdura Film); The Bill; Diolch Iddo and High Performance (HTV).