Sir Iain McMillan spent twenty-three years with the TSB Group prior to joining the Confederation of British Industry (CBI) in 1993. He held the position of Director, CBI Scotland for nineteen years until 2014. Sir Iain is currently Chairman of the University of Strathclyde Business School Advisory Board; a Member of the Audit & Risk Assurance Committee of the Competition Service; and Honorary Patron and former Chairman of the Scottish North American Business Council (SNABC).
Other appointments have included: Membership of the Boards of the Scottish Qualifications Authority, the NHS Scottish Ambulance Service; the British American Business Council; and the Teaching Awards Trust. Over the years, he has served on other Boards and public policy groups, including the Commission on Scottish Devolution (Calman Commission). He also chaired the Independent Commission for Competitive and Fair Taxation in Scotland. In 2003, Sir Iain was appointed CBE for services to the business community and lifelong learning in Scotland. In 2015, Sir Iain was knighted for services to the Scottish economy and, in 2018, was appointed a Deputy Lieutenant of Stirling and Falkirk. Sir Iain is also a Fellow of The Royal Society of Edinburgh and a Freeman of the City of Glasgow.