Daw Malcolm yn wreiddiol o Ogledd-ddwyrain Lloegr ac astudiodd yn y University of Hull. Mae ei waith blaenorol ar gyfer WNO yn cynnwys War and Peace, In Parenthesis a TheSeven Deadly Sins.
Mae ei waith opera diweddar yn cynnwys Carmen (Glyndebourne); Madame Butterfly (Royal Danish Opera); Rusalka (Santa Fe); Orpheus in the Underworld (ENO); The Turn of the Screw (Garsington); Ivan the Terrible (Grange Park); The Coronation of Poppea (Opera North); Hercules (Bäyerisches Staatstheater); Stiffelio (Opéra national du Rhin); La Belle Hélène (Opéra national de Lorraine); Breaking the Waves (Theater St Gallen).
Mae ei waith theatr yn cynnwys My Brilliant Friend (National Theatre); Bagdad Cafe (Old Vic); Songs for Nobodies, The Umbrellas of Cherbourg, Six Characters in Search of an Author, Captain Corelli's Mandolin (West End); Brief Encounter (West End/Broadway – WhatsOnStage a OBIE Awards); Titus Andronicus (RSC); Blue Beard (Wise Children); Tristan & Yseult (Kneehigh).
