·Consultant to the Parliamentarian, U.S. House of Representatives
·Co-Author, "Parliament & Congress"
·Parliamentarian, U.S. House of Representatives (1994-2004)
·Various positions including Deputy Parliamentarian and Assistant Parliamentarian
· Observer, Council of the Law Society of Scotland
· Co-Author, "Parliament & Congress"
·Clerk of the House of Commons and Chief Executive of the House Service
·Clerk Assistant, House of Commons