Thibaudeau operated the Montreal branch of his older brother Isidore's company until 1895.
In 1890, he was named sheriff for the city of Montreal.
He was also president of the electric company and vice-president of the telephone company.
Thibaudeau was a member of the first Board of directors, Bell Telephone Company of Canada (Bell Canada) in 1880, and Northern Electric and Manufacturing Company Limited (Nortel).His nephew Alfred Thibaudeau also served in the Canadian senate.
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