Alexander Rennie was one of three brothers - Alex, John F. Rennie, and James Rennie - who came to the Chickasaw Nation from Canada and prospered greatly. Alex was National Treasurer under William M. Guy, who won a hotly contested election for governor in 1886. When William Byrd unseated him two years later, Rennie was succeeded by D. Osborne Fisher.
Sherman Daily Register
Mr. and Mrs. A. Rennie
The subject of this sketch was born at Kingston, Canada, in October, 1828; is the son of Alex. Rennie, of Aberdeen, Scotland, one of the first settlers in Toronto, Canada. Mr. Rennie came to Fort Washita in 1856, and joined the Chickasaw Battalion as adjutant at the breaking out of the war. Soon, however, he was relieved from duty to serve Governor Harris in the capacity of National secretary, which post he occupied for four years, at the expiration of which he filled the office of National auditor for the four following years.
In 1882 he went to Denison, Texas, where he purchased property and erected some fine buildings, filling the office of school superintendent and member of the city council between the years 1882 and 1886. Mr. Rennie is now  vice-president of the State National Bank, the safest institution of the kind in Texas, which his taxable property in Denison exceeds seventy-five thousand dollars. Add to this his home property at Wolf Springs, the house and improvements alone which cost ten thousand dollars, together with live stock, and Mr. Rennie will show up among the wealthiest men of the Chickasaw Nation.
During the administration of Gov. William Guy, he was appointed National Treasurer, but transferred his responsibility to D. O. Fisher when the Byrd party assumed the reins of government.
Alexander Rennie was married in 1861 to Mary Humphrey, daughter of Richard Humphrey, her mother's maiden name being Sallie McClish, who was also mother of the late Holmes Colbert, National delegate to Washington. Mrs. Rennie, a lady of refinement and remarkable spirit, was educated at Wapanucka Academy and Colbert's Institute. She spent much of the early part of her life with her mother on Caddo Creek until her marriage. Recently a rich discovery of asphaltum has been made upon her property in that vicinity, which will soon be in a fine way of development.
[Source: O'Beirne, Harry F. Leaders and Leading Men of the Indian Territory, with Interesting Biographical Sketches ... Profusely Illustrated with Over Two Hundred Portraits and Full-Page Engravings, vol. 1: Choctaws and Chickasaws (Chicago: American Publishers Association, 1891); reprint, Conway, AR: Oldbuck Press, 1994.]
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