Joseph Louis Rosefield (18 Dec 1882 - 8 Nov 1958) was a California food businessman who invented modern, nonseparating peanut butter in 1922 – 1923.
His new production process was licensed to another company to make Peter Pan peanut butter in 1923.
Rosefield Packing later marketed Skippy peanut butter in 1932; both brands are still sold today.
Among other roles, Rosefield Packing provided emergency supplies of peanut butter to Hawaii during World War II.
His company promised a one-year shelf life for the product and claimed that it tasted better and was less sticky than previous formulas.