Malcolm was Clerk of the House of Commons from 2006-2011. During his career in the House he served in all the offices of the Clerk’s Department, specialising in procedure and parliamentary privilege. He has advised many Commonwealth parliaments and LEGCO, Hong Kong where he was brought up. He edited the current, 24th edition of Erskine May. He is also an academic historian and author of a number of books and numerous essays and reviews. He has lectured and taught in various universities, most recently in Singapore on social and political philosophy. He was appointed KCB in 2011, elected FSA in 2012 and FRAS in 2019.