[4] As a young businessman, Kellogg started out selling brooms in his hometown of Battle Creek, Michigan.

returned home in November 1879 to help his brother John Harvey Kellogg manage the Battle Creek Sanitarium.

The Kellogg family are of paternal English descent which can be traced to three brothers Daniel, Joseph and Samuel, of Braintree, Essex, England, who emigrated to the Connecticut colony in the 17th century.

[6] John Kellogg described the Sanitarium system as "a composite physiologic method comprising hydrotherapy, phototherapy, thermotherapy, electrotherapy, mechanotherapy, dietetics, physical culture, cold-air cure, and health training".

Kellogg promoted cereals, especially corn flakes (maize), as a healthy breakfast food.

At the time, the standard breakfast for the well-off was eggs and meat, while the poor ate porridge, farina, gruel and other boiled grains.

During the Great Depression, Kellogg directed his cereal plant to work four shifts, each lasting six hours.

Will Keith Kellogg died at the age of 91 in Battle Creek, Michigan, on October 6, 1951, of circulatory illness.

as follows: It is my hope that the property that kind Providence has brought me may be helpful to many others, and that I may be found a faithful steward.The philanthropy of W. K. Kellogg is recognized as instrumental to the founding of California State Polytechnic University, Pomona (Cal Poly Pomona) and Kellogg College, Oxford.

[18] Kellogg appears in "The Manual for Murder" (February 18, 2019), episode 16 of season 12 of the Canadian television period drama Murdoch Mysteries.