Businessman, Canadian Politician, Premier of Saskatchewan. A member of the Liberal party, he served as the 3rd Premier of Saskatchewan in Canada from April 1922 until February 1926 and a member of the Canadian Parliament for Regina from 1926 until 1930. Born in England, he became an iron worker at the age of 17 and traveled to East Central Saskatchewan in Canada to work as a farm hand. Soon afterwards he convinced the rest of his family to join him and he filed for a homestead in the Beaverdale district, west of Yorkton, in southeastern Saskatchewan. During his brief farming career, he became involved in the local of the Territorial Grain Growers' Association, an early proponent of a farmer-owned cooperative grain marketing system. At his first general meeting of the Association, he was promptly elected as a director and the following year he was elected as vice-president of the Association. In 1910 he was appointed to the newly incorporated Saskatchewan Co-operative Elevator Company as a provisional director, the youngest man on the Board at age 25. He oversaw its capital campaign and the following year he was rewarded for his efforts by being named the first general manager of the Company and four years later it became the largest grain handling company in the world. As manager, he was instrumental in developing a provincial hail insurance scheme, which survives today as Saskatchewan Municipal Hail Insurance. He then turned his interest to politics and in 1916 ran unopposed for the Legislative Assembly of Saskatchewan as a Liberal in a by-election held in the Kinistino constituency and was acclaimed a Member. He persuaded the farmer's movement in Saskatchewan to support the Saskatchewan Liberal Party and the Liberal Party of Canada. In the 1917 General Election he won a contested race for the seat of Moose Jaw County and remained the member for Moose Jaw County for the rest of his time in provincial politics. He ran unopposed in the general election of 1921, and won a contested race in the general election of 1925. During the 1920s he was able to maintain support for both the federal and provincial parties at a time when farmers elsewhere switched their support to the Progressive Party of Canada and the United Farmers. Between 1916 and 1922 he held a series of Cabinet posts, which included appointments as Provincial Secretary and Provincial Treasurer, and as the Minister of Agriculture, Minster of Municipal Affairs, Minister of Railways, and Minister of Telephones. In 1922 he became Premier of Saskatchewan at the age of 37. In 1926 he was persuaded by the Federal Liberals to join the minority government of Prime Minister William Lyon Mackenzie King. He won the seat of Regina in the Canadian Parliament by acclamation in a by-election held in March, and was immediately appointed to Cabinet as Minister of Railways and Canals. During his time as Minister of Railways and Canals, he was a staunch supporter of Sir Henry Thornton, the US-born Englishman who, in 1922 had taken over the presidency of the Canadian National Railways who, with Dunning's influence, built a branch line to Parkview, Saskatchewan. He also settled a longstanding debate by choosing Churchill, Manitoba as the terminus of the Hudson Bay Railway. In 1929 he became Minister of Finance and earned a reputation for hard work and fairness. He was defeated by R.B. Bennett in the 1930 General Election for his parliamentary seat and he returned to his home and engaged in a new business venture by reorganizing an under-performing subsidiary of the Canadian Pacific Railway, thereafter establishing a reputation as a brilliant re-organizer of insolvent companies. When King became Canada's Prime Minister again in 1935, he persuaded him to re-enter politics and was acclaimed in a 1936 by-election held in the constituency of Queen's in Prince Edward Island and he returned to the Finance portfolio. One of his accomplishments during this term was the establishment of the Central Mortgage Bank, today the Canada Mortgage and Housing Corporation. In 1939 he left politics due to poor health and relocated to Montreal, In Quebec, Canada. In 1940 he was appointed as President and CEO of Ogilvie Flour Mills and was awarded an Honorary Doctorate by Queen's University in Kinston, Ontario, Canada, and became Chancellor of the University. He also received Honorary Doctorates from McGill University in Montreal (1939) and the University of Saskatchewan at Saskatoon, Saskatchewan (1946). He sat on a number of prestigious corporate and bank boards, including that of the Canadian Pacific Railway. He died at the age of 73.