Karren trained at Guildford School of Acting.
Theatre credits include: 'Class and Corruption' for The School,
'Old Boys' Hampstead Theatre 'Blithe Spirit' Vienna's English Theatre 'The Ladies Cage' Manchester Royal Exchange Studio and The Finborough
'Year 10' The Finborough, Time Out Critics' Choice Season BAC, National Theatre of Strasbourg and Rennes Festival
'The Importance of Being Earnest' Shooting Fish Company
'Margaret Down Under' Eastern Angles Theatre Company
'Precious Bane' Pentabus Theatre Company 'Sons and Lovers' Snap Theatre Co, 'The Browning Version' and 'The Twelve Pound Look' Bath Theatre Royal and Tour
'A Doll's House' and 'Electra' Compass Theatre Company
'A Clockwork Orange' and 'Crystal Clear' National Tours
'Oliver!' The Marlowe Theatre, Canterbury 'Jimmy Cliff' Theatre 503
Television and Film includes:
'Eastenders''Dr Who' 'Julian Fellowes' Most Mysterious Murders'
'A Fight To the Death - The David Kelly Story' all for the BBC
'The Bill' Talkback Thames,
'After Now' and 'True' Channel 4,
'To Kill Again' Newlyn Productions,
'Sam's Story' The Edge Picture Company.
'Hard Road' BBC Radio 4
'The Third Wright Brother' and 'The New Writing South Season' BBC Radio Kent.