Warner was born in London and went to Woodhouse School in Finchley, North London and then studied English and drama at the University of Bristol from 1975-78. He subsequently worked as an actor, a teacher of drama therapy and a fringe theatre director. He joined English National Opera in 1981, working as revival director, staff director and associate director until 1989. In 1985, he also worked as associate director for Scottish Opera.
Warner was appointed artistic director of the Royal Danish Opera, taking up the post in July 2011, but resigned after six months, along with conductor and music director Jakub Hrůša, as a result of problems with funding.
In the 2014/15 Season he directed Welsh National Opera's production of Peter Pan at the Royal Opera House and on tour.
- Adam, Nicky (ed) (1993). Who's Who in British Opera. Aldershot: Scolar Press. pp. 282–3. ISBN 0-859-67894-6.CS1 maint: Extra text: authors list (link)
- "Keith Warner heads for Royal Danish Opera". Gigmag.co.uk. 24 May 2010. Archived from the original on 20 April 2013. Retrieved 8 January 2013.
- Service, Tom (26 September 2012). "Keith Warner on his Royal Opera House Ring Cycle". London: The Guardian. Retrieved 8 January 2013.
- Bohn, Ullrich (24 October 2005). "Wagners "Tannhäuser" in der Provinz". Deutschlandfunk (in German). Retrieved 27 August 2017.
- "Warner and Hrusa quit Royal Danish Opera." Gramophone, 24 January 2012
- "Keith Warner DIRECTOR". Royal Opera House.
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