One of his nieces, Beatrix Hamilton, was married to Canadian economist and humourist Stephen Leacock.
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Jarvis also formed AEmilius Jarvis & Co., earning the friendship and respect of such men as Lord Minto (Governor General of Canada), J.P. Morgan, Sir Thomas Lipton, Lord Beaverbrook, Sir Henry Pellatt, and Ned Hanlan.
In Toronto, E. J. Lennox designed Casa Loma in the Gothic Revival style for Sir Henry Pellatt, a prominent Canadian financier and industrialist.
These included Senator John Macdonald's Oaklands, the Eaton family's Ardwold, Samuel Nordheimer's Glenedyth, James Austin's Spadina, William McMaster's Rathnelly, and most prominently Henry Pellatt's Casa Loma.