Neilson Dairy, simply, means the best milk and milk products in the world made with the best quality ingredients and the best production techniques, and delivered by the best people.

From its founding in 1893, the William Neilson Company was dedicated to "nothing but the best."

William Neilson, the son of Scottish immigrants, was born on a farm near Almonte in Southern Ontario. Trained as a machinist, he moved to Toronto in 1890 to open a grocery store. Three years later, the business was bankrupt. William rented a house on four acres of land for $4 a month for his family, then went to work on his brother's farm in North Dakota for $4 a day.

William sent as much money back to his family as he could; meanwhile, his wife, Mary, sold her home-made mincemeat pies door to door, while their oldest son, Morden, milked the family cow and sold the milk door to door on his way to school.

When William Neilson returned from North Dakota after the harvest, he took a chance, investing every penny the family had saved in seven cows and some used, hand-cranked ice cream makers.

Neilson's Ice Cream was an instant success. In their first summer as ice cream makers, the Neilson family sold an amazing 3,750 gallons, earning a profit of $3000 - a princely profit in 1893.

The business quickly prospered and grew, and in 1904, William Neilson built a three-storey home with an attached factory on Gladstone Avenue in Toronto. The only trouble was, ice cream sales tend to fall off in the winter. Neilson knew he had to keep his 25 skilled employees working year round, so he launched a line of chocolates. Again, he used only the best ingredients, and Neilson chocolates were an instant success as Neilson's ice cream had been.

As the business grew, William ensured the critical supply of milk when he purchased a former cheese factory in Beachville, Ontario, buying dairy products from surrounding farmers.

By 1915, when William Neilson died at the age of 71, the Neilson company was producing a million pounds of ice cream every year and 500,000 pounds of chocolate.

William's second son, Morden, took over the company at his father's death in 1915. But he had worked his way up through the company - starting as a milker and ice cream churner at the company's founding. Under his leadership, William Neilson Ltd. became the largest producer of ice cream in the British Commonwealth and the largest manufacturer of chocolates around the world, earning international renown.

Morden continued the traditions established by his father. He was a "hands-on" manager, intimately involved in the daily operations of the company. He was an innovative promoter: in summer 1921, he dressed a man in a heavy parka like an "Eskimo" to walk up and down Yonge Street to introduce Eskimo Pies. and in 1924, he used a contest to launch what became the company's all-time best-seller: the Jersey Milk chocolate bar. The first prize: a Jersey cow.

William Neilson always treated employees like family - it was his concern for his employees and his desire to keep them that inspired the creation of Neilson chocolates. The company's several employee picnics every year became  a local event. Morden Neilson continued this tradition with ball games, lunch hour concerts and winter sleigh rides for the employees. He knew all of his 1000 employees by name, and the names of their wives. The strong relationship between Morden and the Neilson employees was shown when Morden was diagnosed with leukemia in 1947: hundreds of employees donated blood for his treatments. All were saddened when, on August 26, 1947, Morden Neilson succumbed to his illness; he was buried beside his parents in the Forest Lawn Mausoleum in the north end of Toronto.

When it acquired William Neilson Ltd. in 1947 (for $45 a share), Weston already owned and operated two dairies: the Donlands Dairy in eastern Toronto, and the Royal Dairy in Guelph, Ontario. In 1947, Weston acquired Clark Dairy in Ottawa. Each one operated independently, each with its own label. In 1981, the company incorporated all three under one corporate structure, giving them all the popular Neilson brand name. Now fluid milk products were part of the Neilson lineup.

Meanwhile, the Gladstone Avenue plant continued to produce Neilson ice cream, from premium to economy brands, and Neilson chocolate bars such as Jersey Milk, Malted Milk, Mr. Big and others. In 1987, Neilson purchased the Canadian operations of the Cadbury Confectionery Company, and started producing Dairy Milk, Caramilk and several other brands. Once again, William Neilson Ltd. was the largest candy bar manufacturer in Canada.

In 1981, Neilson also got exclusive distribution rights and a manufacturing license to produce Haagen-Dazs premium ice cream.

In 1990, William Neilson Ltd. sold its ice cream production business, including the Haagen-Dazs license, to Ault Foods and restructured into two separate companies: Neilson Cadbury, based on Gladstone Ave., producing chocolates and confections; and Neilson Dairy, based in Halton Hills (Georgetown) and with a facility in the former Clark Dairy premise in Ottawa, producing milk products. George Weston Limited sold Neilson Cadbury in 1996.