He was born in Eldersley near Paisley, Scotland, the son of Robert Haggert and Barbara Longhead. Haggert was educated in Scotland and, when he was eighteen, moved to New York City where he trained as an engineer. In 1842, he moved to Hamilton, Canada West, where his parents also settled. He then moved to Beamsville, where he manufactured agricultural implements, later moving his business to Brampton in 1849. He was later joined by his brothers and later became president of the Haggert Brothers Manufacturing Company. Haggert also served on the Brampton school board. In 1851, he married Catherine Cochrane.
- Ontario Death Registration #013350-1887
- A Cyclopæedia of Canadian biography : being chiefly men of the time, GM Rose (1886)
- Brampton : An illustrated history, HV Loverseed (1987)
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