Later, offered the opportunity to manage a flour mill (Granite Mills) in Waterloo, Ontario, he learned about the distilling process at Waterloo Distillery, a small aside to the George Randall Company's flour business, using extra grain stocks to make alcoholic beverages. In 1869, five years after joining the company, Joseph Seagram bought out one of the firm's three partners (George Randall) to become Seagram and Roos, then in 1883 became the one hundred percent owner（buying out William Hespeler and William Roos）and renamed it Seagram. Making whisky became the most important part of the business and Seagram built it into one of the country's most successful of its kind. His 1907 creation, Seagram's VO whisky, became the largest-selling Canadian whisky in the world.