Sir Malcolm Roy Jack KCB (born 1946) was the Clerk of the House of Commons

Clerk of the House of Commons

The Clerk of the House of Commons is the chief executive of the House of Commons in the Parliament of the United Kingdom, and before 1707 of the House of Commons of England...

 of the United Kingdom from 2006 to 2011. He began service with the House of Commons in 1967. He was appointed Principal Clerk in 1991 and served as secretary to the House of Commons Commission

House of Commons Commission

The House of Commons Commission is the overall supervisory body of the House of Commons Administration in the United Kingdom. The Commission is a corporate body established by the House of Commons Act 1978...

 from 1995 to 2001. He then served as Clerk of the Journals (2001–03) and Clerk of Legislation (2003–06) before being appointed Clerk. He was succeeded by Robert Rogers

Robert Rogers (Clerk)

Robert James Rogers is the Clerk of the House of Commons of the United Kingdom. He succeeded Sir Malcolm Jack on 1 October 2011. Rogers joined the House's service in 1972 and was appointed Principal Clerk in 1998...

 on 1 October 2011.

Jack was appointed Knight Commander of the Order of the Bath (KCB) in the 2011 Birthday Honours

2011 Birthday Honours

The Birthday Honours 2011 for the Commonwealth Realms were announced on 7 June 2011 in New Zealand and 11 June 2011 in United Kingdom to celebrate the Queen's Birthday of 2011.-Privy Councillors:...

. He was also the editor of the 24th edition of Erskine May: Parliamentary Practice.