Will Keith Kellogg was born on April 7, 1860, in Battle Creek, Michigan, to Ann Janette and John Preston Kellogg as the seventh of their 16 children. Will was interested in business affairs from a young age and by the time he was 13. He dropped out of school in his mid-teens and joined his father’s business.

As a young businessman, Will Keith Kellogg started out selling brooms, before moving to Battle Creek, Michigan, to help his brother John Harvey Kellogg run the Battle Creek Sanitarium. The Sanitarium, originally the Western Health Reform Institute, was part of a pioneering effort based on the health principles advocated by the Seventh-day Adventist Church.

John Harvey Kellogg (February 26, 1852 – December 14, 1943) was an American medical doctor, nutritionist, inventor, health activist, eugenicist, and businessman. He was the director of the Battle Creek Sanitarium in Battle Creek, Michigan.

Kellogg was a major leader in progressive health reform, particularly in the second phase of the clean living movement. He wrote extensively on science and health. His approach to "biologic living" combined scientific knowledge with Adventist beliefs, promoting health reform, temperance, and sexual abstinence.

At this time Dr. John Kellogg was experimenting with new foods and was trying to develop healthy vegetarian foods to serve his patients. In 1894, Will accidentally discovered the method of making toasted wheat flakes which proved to be a nutritious breakfast product. The brothers were delighted at this discovery and soon realized that the process worked just as well with oats, rice and corn.

The Kellogg brothers started the Sanitas Food Company around 1897 which promoted their whole-grain cereals as a healthy and convenient breakfast option. W.K. Kellogg had great persuasive skills and he helped market the cereals to the target consumers.

W.K. Kellogg realized that the process of making cereals held great commercial potential and faced the threat of being copied by others, so he asked his brother to keep the process of making the cereals a secret. John however disagreed and took no steps to guard the secret. This upset Will to the extent that he left the sanitarium to create his own company. In 1906, Will founded the Battle Creek Toasted Corn Flake Company, which later became the Kellogg Company.

He lived a long life, and spent most of his later years engaged in philanthropic endeavors. W. K. Kellogg died at the age of 91 in Battle Creek, Michigan, on October 6, 1951.

Today, the company produces a variety of cereal and convenience foods, including cookies, crackers, toaster pastries, cereal bars, and fruit-flavored snacks. The company’s products are manufactured in 18 countries and marketed in over 180 countries.

According to en.wikipedia and thefamouspeople.com