in 1948 His brother expanded the family's flour mills and renamed the firm A. W. Ogilvie & Co., of Montreal. William joined his brothers, Alex and John, as a partner in May 1860. In 1868, William, accompanied by his brother Alexander Walker Ogilvie, travelled to
Hungary to inspect the latest milling processes and adopted them into their own mills to produce a superior grade of flour. By 1872, the company was expanding into
Ontario. When Alex entered politics, William succeeded him in running the firm from Montreal. The Ogilvies shipped their first load of wheat from
Manitoba in 1877 and for the next decade dominated the
grain trade of western Canada, which was experiencing an agricultural boom. They built a mill at
Winnipeg in 1882. They made an agreement with
William Cornelius Van Horne and formed a monopoly with the
Canadian Pacific Railway in exporting grain from Manitoba. By 1884 alone, this brought them a profit of $50,000. Manitoban producers complained, but the Ogilvies' monopoly continued with the growth of the
Canadian West. A worker at their Montreal mill recalled William Ogilvie: "He was a fine figure of a man, tall, with a keen face and impressive sideburns, the very cut of a cavalry officer. He led his millers a merry life – always hiring, discharging and re-hiring them." Ogilvie assumed total control of the company after his brother John died in 1888. By the turn of the century, he had made the firm the largest milling company in the Dominion, with a worldwide reputation for producing high-quality flour. Ogilvie was the president of the
Montreal Board of Trade in 1893 and 1894, and a member of its council for six years. He was also a director of the
Bank of Montreal, the Montreal Transportation Company, the North British and Mercantile Insurance Company, and a founding director of the Royal Trust Company. A generous philanthropist, he supported numerous charities and institutions across Canada including
McGill University and the
Winnipeg General Hospital. In politics, he was a member of the Conservative party. He campaigned for his brother Alexander Walker's appointment to the Senate in 1881, noting in a letter to Prime Minister Sir John A. Macdonald the past loyalty of the Ogilvie family to the party. He made substantial contributions at election time and favoured Macdonald's National Policy. ==Family and private life==