Theatre Williams's breakthrough performance came in 1991 when she appeared in ''
The Revengers' Comedies'', In 1992, she played the role of Carol in the original production of
David Mamet's
Oleanna, at the
Theatre Royal, Bath, transferring to the
Royal Court Theatre in 1993. In 1995, Williams appeared opposite
Michael Gambon in
David Hare's
Skylight at the
National Theatre. Other leading theatre performances include
Rosalind in
As You Like It for the
RSC, Winner chose her after seeing her in an
Alan Ayckbourn play. Subsequent film appearances have included supporting roles in
Firelight (1997), In 2009, Williams directed
Dog Alone, On stage, she has also directed
The Matchbox, by
Frank McGuinness for
Liverpool Playhouse and the
Tricycle Theatre and
Ashes to Ashes as part of the Harold Pinter Season in the West End (2019). In 2021, Williams directed an acclaimed production of
Doubt by John Patrick Shanley at
Chichester Festival Theatre, West Sussex. ==Personal life==