He held a number of chairmanships, including the Committee on Finance and Industry in 1929-31, the Canadian Royal Commission on Banking and Currency in 1933, the Pilgrim Trust from 1935–52, the Political Honours Committee from 1935–52, the court of the University of London from 1929–43, and the BBC Advisory Council from 1936-46.
Chaired by Scottish jurist Hugh Macmillan, it also included Bank of England director Sir Charles Addis, former Canadian Finance Minister William Thomas White, Banque Canadienne de Montreal general manager Beaudry Leman, and Premier of Alberta John Edward Brownlee.
Hugh Masekela | Harold Macmillan | Hugh Jackman | Hugh Grant | Hugh Laurie | Hugh Hefner | Macmillan Publishers | Hugh | Hugh O'Brian | Palgrave Macmillan | Macmillan | Hugh Grosvenor, 2nd Duke of Westminster | Hugh Percy, 2nd Duke of Northumberland | Hugh Percy, 1st Duke of Northumberland | Hugh Martin | Hugh Dennis | Hugh Walpole | Hugh O'Neill, Earl of Tyrone | Hugh de Lacy | St Hugh's College, Oxford | James MacMillan | Hugh Wheeler | Hugh Trenchard, 1st Viscount Trenchard | Hugh Trenchard | Hugh Pughe Lloyd | Hugh MacDiarmid | Hugh Lloyd | Hugh Greene | Hugh Carey | Macmillan Cancer Support |
In 1890, he became a fellow of the Royal Society of Edinburgh, upon the proposal of Sir William Thomson, Robert Flint, Hugh Macmillan and James Lindsay.