Katherine trained at Royal Welsh College of Music and Drama.

Theatre work includes Husbands and Sons (National Theatre/Royal Exchange); Stab in the Dark, A Series of Increasingly Impossible Acts, Glitterland, Chamber Piece, A Streetcar Named Desire and Woyzeck (Secret Theatre, Lyric Hammersmith); Port (National Theatre); and Round ‘Ere (Bush/Edinburgh Fringe).

TV includes Three Girls, Youth Hyacinth and Our Girl.

Films include My Cousin Rachel, Steven and The Last Photograph.

Radio includes The Righteous Sisters.