Henry Squarebriggs McKay (Mackay) was born on September 10, 1860 or 1861, in Kinloch, Middle Ohio, Shelburne, Nova Scotia, the son of James McKay (MacKay) and his wife, Mary Ann Squarebriggs (daughter of Henry Squarebriggs).
He married on November 3, 1886, in Shelburne, Nova Scotia, to Robena (Robina/Ruby) MacKay (b. 19Aug1859 in Shelburne; d. 15Jun1948 in Orange Co. CA), daughter of Robert MacKay and his wife, Rosanna Deinstadt. Henry and Robena MacKay were second cousins.
Henry MacKay died on October 9, 1948, in Orange County, California.
Henry MacKay was educated in Canada. In about 1881, he entered the offices of Thomas William Silloway, known for his work in designing churches throughout New England. In about 1883, the formed a partnership, Silloway and McKay, which continued until about 1886. McKay then practiced alone until 1888, when he took his former draftsman, Frank Warren Smith, into partnership, forming the firm of McKay and Smith.
Henry McKay’s work included the First Baptist Church in Malden; Prospect Congregational Church in Somerville; the Charles River Baptist Church in Cambridge; the Dearborn Street Baptist Church in Roxbury; and the Amherst Town Hall.
McKay and Smith designed The Abbotsford at 184-188 Commonwealth, in which both Henry McKay and Frank Smith (and Smith’s mother, Jane (Ross) Smith Palmer) had ownership interests. McKay and Smith dissolved in about 1892 and Frank Smith became a sole practictitioner.
In 1892, Henry McKay changed the spelling of his surname to Mackay and formed a new partnership with Charles Blanchard Dunham, who had been a draftsman in his office, establishing the firm of Mackay and Dunham.
In mid-1895, Charles Dunham went to Europe to continue his architectural studies, resuming his practice at Mackay and Dunham upon his return. The firm continued until 1899, after which Charles Dunham continued as a sole practicitioner.
Mackay and Dunham designed apartment houses, hotels, and commercial buildings, among them The Chesterfield at 371 Commonwealth (1892), The Ericson at 373 Commonwealth (1892), The Empire at 333 Commonwealth (1895), The Tuileries at 270 Commonwealth (1896), and the Blackstone Block on North Street (1899).
In addition to his architecture practice, Mackay also was the owner of at least two of the apartment hotels that Mackay and Dunham had designed: the Empire and The Tuileries. In 1899, they were sold at auction in foreclosure. Henry Mackay moved to Salt Lake City soon thereafter, and was living Denver in June of 1900, at the time of the 1900 US Census.
By 1903, he had moved to Ocean Park, California, and had become Vice President of the United Mining and Exploration Company. By 1908, he had moved to Belvedere and was an architect with Woodruff Company in San Francisco. By 1910, he had moved south again, was living in Riverside, and had resumed his interest in mining, establishing the MacKay Copper Process Company.
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