As president of the board of directors of Dow Breweries, Gendron convinced the brewer to fund a planetarium in Montreal, overseeing the creation of the Dow Planetarium.
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President of the board of directors of Dow Breweries, Gendron convinced Dow to create a world-class planetarium in Montreal, as part of the Canadian Centennial celebrations.
He was vice-president for two insurance companies and the Champlain Paper Box Company and served as director for a number of companies, including the Shawinigan Water and Power Company, the Saint Lawrence Cement Company (now part of Holcim) and the Dow Brewery.