Barrett McCullagh & Co. was a Canadian firm specializing in oil, mining, and gold share sales. It was established in the late 1920s by George McCullagh and Richard Barrett, both interested in the financial aspects of oil and gold mining in Canada.

McCullagh also worked for the Toronto Stock Exchange and ended top as one of the wealthiest and most powerful media moguls in Canada, owning The Globe and Mail newspaper, and later the Toronto Telegram. He was also active in politics, co-founding the conservative Leadership League.

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