Mayor of Halifax
In 1884, he was elected as the Mayor of Halifax, replacing George Fraser in office. He held the role until 1887 and was succeeded by Patrick O'Mullin after his term ended.[15] As mayor, he initiated public works projects, including the foundation of the Halifax Dry Dock and the renovation of Grand Parade.[2] He also played a key role in starting a regular ferry service between Dartmouth and Halifax.[1]
J. C. Mackintosh was appointed to the international committee of the Halifax Young Men's Christian Association in July 1886.[16] He later served as the president of the Halifax chapter.[1] Named vice president of the Victoria School of Art and Design (now NSCAD) in 1888, he held the position for one term before continuing as a director and acting as an auditor in 1897.[17]
In 1889, he was serving as vice-president of Starr Manufacturing Co. which was presided over by William James Stairs.[18]
He led the Society for the Prevention of Cruelty to Animals (SPCA) in Nova Scotia as president during 1890–91.[19] A longtime supporter of the Halifax School for the Blind, Mackintosh was named a benefactor in 1892 after a decade on the board of directors. In 1898, he was serving as the school's vice president and in multiple standing committees.[20]
On 6 February 1893, Mackintosh was elected president of the Nova Scotia Bible Society, the Nova Scotia branch of the British and Foreign Bible Society.[21]
He joined T. E. Kenny, Thomas Fysche, and J. F. Stairs in founding the Eastern Trust Company in 1893.[22] On 7 April of that year, he was appointed as a provisional director.[23]
As a member of the Halifax Board of Trade (now Halifax Chamber of Commerce), he served on the Board of Arbitrators by the mid-1890s.[5]
Serving as president in 1895, James C. Mackintosh oversaw the Y.M.C.A. in Halifax and its Richmond branch. He chaired the organization's provincial committee for the Maritime provinces as a corresponding member of the international committee.[24]
His son-in-law John E. Wood became a partner in J. C. Mackintosh & Co. in 1904 after marrying his daughter Gertrude Mary Mackintosh.[5] That year, J. C. Mackintosh was elected to the Board of Directors of the Dartmouth Electric Light Company.[25] He held the roles of vice president and director at the Eastern Canada Savings & Loan Co., Ltd, under the presidency of S.M. Brookfield.[26] By 1905, Mackintosh held a seat on the board of governors of Dalhousie College until 1919.[27]
In 1914, Mackintosh held several prominent business positions which included president of Starr Manufacturing Co. and a director of both Eastern Trust Co. and St. Croix Lumber Co.[5] He retained control of his banking business until 1922, when he was forced to transfer control to his son A. F. Mackintosh and J. E. Wood.[27]