Kellogg’s was founded as the Battle Creek Toasted Corn Flake Company on February 19, 1906, by Will Keith Kellogg as an outgrowth of his work with his brother John Harvey Kellogg at the Battle Creek Sanitarium following practices based on the Seventh-day Adventist Christian denomination. The company produced and marketed the hugely successful Kellogg’s Toasted Corn Flakes and was renamed the Kellogg Company in 1922.

In 1930, the Kellogg Company announced that most of its factories would shift towards 30 hour work weeks, from the usual 40. This practice remained until World War II, and continued briefly after the war, although some departments and factories remained locked into 90 hour work weeks until 1980. From 1969 to 1977, Kellogg’s acquired various small businesses including Salad Foods, Fearn International, Mrs. Smith’s Pies, Eggo, and Pure Packed Foods; however, it was later criticized for not diversifying further like General Mills and Quaker Oats were.

Info gleaned from Wikipedia