GLEN ARBOR, Mich. (AP) — William Post, a Michigan man who played an important role in the development of Pop-Tarts, has died at age 96.

Post died Saturday, according to a family obituary that provided no details about how he died.

According to the family, Post retired at age 56 as a senior vice president with the Keebler Company and settled in Glen Arbor, Michigan.

Kellanova, formerly known as Kellogg Co., said in a statement Wednesday that Post “played an important role in co-creating the iconic Pop-Tarts brand.”

Pop-Tarts debuted in 1964 in Cleveland, Ohio, before the toaster pastry was released nationwide the following year, Kellanova’s website states.