Bearing a faint pencil notation on the reverse side that reads "July '00" and a later ink notation of "Andy Imlack", I believe this photograph depicts Andrew Alexander Imlach while  
member of the fledgling Canadian Army Service Corps sometime in the early 1900s.

The uniform being worn by the young Imlach does indeed appear to be that of the Canadian Army Service Corps (CASC) although implied mentioned date of 1900  may have been an
approximation by its unknown author since the CASC did not come into existence until 1901.

Andrew Alexander Imlach was to son of Scottish immigrants Andrew Imlach and Mary Anne MacKenzie. Born on 18 August, 1882 at Carleton Place, Ottawa, Ontario Imlach would
rise to local prominence as the president of the Victoria Foundry Company, Ltd.. Interestingly I can find no reference - aside from this photograph - mentioning Imlach serving in any
Canadian army of militia unit. Additionally Imlach's rather long June 1937 obituary which appeared in
Ottawa Journal makes no mention of him serving in the military. That the man in
the photo is indeed Imlach there is little doubt due to the unmistakable resemblance between this photo and that of an older Imalch that appears with his obituary. It is possible that his
military career was simply too short to figure much in this icon of early 20th Century Ottawa industry.

Andrew Alexander Imlach married Miss Helen Pittaway of Ottawa on 2 March, 1902. The couple wold have tree daughters and one son.  

Interestingly, this photograph of Andrew Imlach was taken by Ottawa photographer Alfred Pittaway - the father of soon to be bride Helen.  

Mounted Photograph
Pittaway - Photographer
Ottawa, Canada
c. 1900